{ "$schema": "https://json-schema.org/draft-07/schema#", "name": "Production-Ready Regex Pattern Library 2026", "description": "115 regex patterns: email, URL, phone, validation, security, dev. Battle-tested.", "source": "Bytepane developer team curation", "attribution": "Data via Bytepane (https://bytepane.com/)", "license": "CC-BY 4.0", "last_updated": "2026-04-26", "total_records": 115, "data": [ { "slug": "email-address", "name": "Email Address", "category": "Validation", "pattern": "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$", "flags": "", "testMatch": "user@example.com", "testNoMatch": "user@.com", "language": "Universal", "useCase": "Form validation, data extraction, contact scraping", "difficulty": "Beginner", "description": "Validates standard email addresses with username, @ symbol, domain, and TLD. Covers most common email formats used in web forms.", "related": [ "phone-number-us", "phone-number-international", "url", "ipv4-address", "ipv6-address", "mac-address" ] }, { "slug": "phone-number-us", "name": "Phone Number (US)", "category": "Validation", "pattern": "^(\\+1)?[-.\\s]?\\(?\\d{3}\\)?[-.\\s]?\\d{3}[-.\\s]?\\d{4}$", "flags": "", "testMatch": "(555) 123-4567", "testNoMatch": "123-45-678", "language": "Universal", "useCase": "Phone input validation, contact forms, CRM data cleaning", "difficulty": "Beginner", "description": "Matches US phone numbers in common formats including with/without country code, parentheses, dashes, dots, and spaces.", "related": [ "email-address", "phone-number-international", "url", "ipv4-address", "ipv6-address", "mac-address" ] }, { "slug": "phone-number-international", "name": "Phone Number (International)", "category": "Validation", "pattern": "^\\+?[1-9]\\d{1,14}$", "flags": "", "testMatch": "+442071234567", "testNoMatch": "+0123", "language": "Universal", "useCase": "International phone validation, E.164 format compliance", "difficulty": "Intermediate", "description": "Validates international phone numbers following the E.164 standard. Supports 1-15 digits with optional plus prefix.", "related": [ "email-address", "phone-number-us", "url", "ipv4-address", "ipv6-address", "mac-address" ] }, { "slug": "url", "name": "URL", "category": "Validation", "pattern": "https?:\\/\\/(www\\.)?[-a-zA-Z0-9@:%._\\+~#=]{1,256}\\.[a-zA-Z0-9()]{1,6}\\b([-a-zA-Z0-9()@:%_\\+.~#?&//=]*)", "flags": "", "testMatch": "https://www.example.com/path?q=1", "testNoMatch": "not-a-url", "language": "Universal", "useCase": "Link validation, web scraping, content parsing", "difficulty": "Intermediate", "description": "Matches HTTP and HTTPS URLs with optional www prefix, domain, path, query parameters, and fragments.", "related": [ "email-address", "phone-number-us", "phone-number-international", "ipv4-address", "ipv6-address", "mac-address" ] }, { "slug": "ipv4-address", "name": "IPv4 Address", "category": "Validation", "pattern": "^((25[0-5]|(2[0-4]|1\\d|[1-9]|)\\d)\\.?\\b){4}$", "flags": "", "testMatch": "192.168.1.1", "testNoMatch": "256.1.1.1", "language": "Universal", "useCase": "Network configuration, log parsing, firewall rules", "difficulty": "Intermediate", "description": "Validates IPv4 addresses ensuring each octet is 0-255. Commonly used in network tools, log analysis, and security applications.", "related": [ "email-address", "phone-number-us", "phone-number-international", "url", "ipv6-address", "mac-address" ] }, { "slug": "ipv6-address", "name": "IPv6 Address", "category": "Validation", "pattern": "^([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}$", "flags": "", "testMatch": "2001:0db8:85a3:0000:0000:8a2e:0370:7334", "testNoMatch": "2001:db8::1", "language": "Universal", "useCase": "Network configuration, DNS records, next-gen networking", "difficulty": "Advanced", "description": "Matches full IPv6 addresses in standard notation with 8 groups of 4 hexadecimal digits separated by colons.", "related": [ "email-address", "phone-number-us", "phone-number-international", "url", "ipv4-address", "mac-address" ] }, { "slug": "mac-address", "name": "MAC Address", "category": "Validation", "pattern": "^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$", "flags": "", "testMatch": "00:1A:2B:3C:4D:5E", "testNoMatch": "00:1A:2B", "language": "Universal", "useCase": "Network device identification, DHCP management, security auditing", "difficulty": "Beginner", "description": "Validates MAC addresses in colon or hyphen-separated format with 6 groups of 2 hexadecimal digits.", "related": [ "email-address", "phone-number-us", "phone-number-international", "url", "ipv4-address", "ipv6-address" ] }, { "slug": "domain-name", "name": "Domain Name", "category": "Validation", "pattern": "^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,}$", "flags": "", "testMatch": "sub.example.com", "testNoMatch": "-invalid.com", "language": "Universal", "useCase": "DNS validation, URL parsing, domain registration checks", "difficulty": "Intermediate", "description": "Validates domain names with proper label formatting, supporting subdomains and various TLD lengths.", "related": [ "email-address", "phone-number-us", "phone-number-international", "url", "ipv4-address", "ipv6-address" ] }, { "slug": "integer", "name": "Integer", "category": "Numbers", "pattern": "^-?\\d+$", "flags": "", "testMatch": "-42", "testNoMatch": "3.14", "language": "Universal", "useCase": "Input validation, number parsing, data filtering", "difficulty": "Beginner", "description": "Matches whole numbers including negative values. Simple pattern for validating integer input in forms or data processing.", "related": [ "decimal-number", "currency-usd", "percentage", "hexadecimal-number", "binary-number", "scientific-notation" ] }, { "slug": "decimal-number", "name": "Decimal Number", "category": "Numbers", "pattern": "^-?\\d+\\.?\\d*$", "flags": "", "testMatch": "3.14159", "testNoMatch": "3.14.15", "language": "Universal", "useCase": "Numeric input validation, scientific data, calculations", "difficulty": "Beginner", "description": "Matches integers and decimal numbers with optional negative sign. Allows trailing decimals for flexible number parsing.", "related": [ "integer", "currency-usd", "percentage", "hexadecimal-number", "binary-number", "scientific-notation" ] }, { "slug": "currency-usd", "name": "Currency (USD)", "category": "Numbers", "pattern": "^\\$?\\d{1,3}(,\\d{3})*(\\.\\d{2})?$", "flags": "", "testMatch": "$1,234.56", "testNoMatch": "$12,34.5", "language": "Universal", "useCase": "Financial data parsing, invoice processing, price extraction", "difficulty": "Intermediate", "description": "Validates US dollar amounts with optional dollar sign, comma-separated thousands, and exactly two decimal places.", "related": [ "integer", "decimal-number", "percentage", "hexadecimal-number", "binary-number", "scientific-notation" ] }, { "slug": "percentage", "name": "Percentage", "category": "Numbers", "pattern": "^-?\\d+(\\.\\d+)?%$", "flags": "", "testMatch": "99.9%", "testNoMatch": "100", "language": "Universal", "useCase": "Data validation, statistics, report parsing", "difficulty": "Beginner", "description": "Matches percentage values with optional decimal places and negative sign, requiring the percent symbol at the end.", "related": [ "integer", "decimal-number", "currency-usd", "hexadecimal-number", "binary-number", "scientific-notation" ] }, { "slug": "hexadecimal-number", "name": "Hexadecimal Number", "category": "Numbers", "pattern": "^(0x)?[0-9a-fA-F]+$", "flags": "", "testMatch": "0xFF00FF", "testNoMatch": "0xGG", "language": "Universal", "useCase": "Color codes, memory addresses, binary data representation", "difficulty": "Beginner", "description": "Validates hexadecimal numbers with optional 0x prefix. Used in color codes, memory addresses, and low-level programming.", "related": [ "integer", "decimal-number", "currency-usd", "percentage", "binary-number", "scientific-notation" ] }, { "slug": "binary-number", "name": "Binary Number", "category": "Numbers", "pattern": "^(0b)?[01]+$", "flags": "", "testMatch": "0b10110", "testNoMatch": "0b102", "language": "Universal", "useCase": "Binary data, bitwise operations, computer science education", "difficulty": "Beginner", "description": "Matches binary numbers (0s and 1s) with optional 0b prefix for standard binary notation.", "related": [ "integer", "decimal-number", "currency-usd", "percentage", "hexadecimal-number", "scientific-notation" ] }, { "slug": "scientific-notation", "name": "Scientific Notation", "category": "Numbers", "pattern": "^-?\\d+(\\.\\d+)?[eE][+-]?\\d+$", "flags": "", "testMatch": "6.022e23", "testNoMatch": "6.022f23", "language": "Universal", "useCase": "Scientific computing, data analysis, engineering calculations", "difficulty": "Intermediate", "description": "Validates numbers in scientific/exponential notation like 1.5e10 or -3.14E-5. Standard format for very large or small numbers.", "related": [ "integer", "decimal-number", "currency-usd", "percentage", "hexadecimal-number", "binary-number" ] }, { "slug": "credit-card-number", "name": "Credit Card Number", "category": "Numbers", "pattern": "^(?:4\\d{12}(?:\\d{3})?|5[1-5]\\d{14}|3[47]\\d{13}|6(?:011|5\\d{2})\\d{12})$", "flags": "", "testMatch": "4111111111111111", "testNoMatch": "1234567890", "language": "Universal", "useCase": "Payment form validation, PCI compliance, fraud detection", "difficulty": "Advanced", "description": "Validates Visa, Mastercard, Amex, and Discover card numbers by their prefix patterns and lengths. Does not verify Luhn checksum.", "related": [ "integer", "decimal-number", "currency-usd", "percentage", "hexadecimal-number", "binary-number" ] }, { "slug": "date-yyyy-mm-dd", "name": "Date (YYYY-MM-DD)", "category": "Date & Time", "pattern": "^\\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\\d|3[01])$", "flags": "", "testMatch": "2026-03-07", "testNoMatch": "2026-13-07", "language": "Universal", "useCase": "ISO 8601 date validation, database input, API payloads", "difficulty": "Intermediate", "description": "Validates dates in ISO 8601 format (YYYY-MM-DD) with valid month (01-12) and day (01-31) ranges.", "related": [ "date-mmddyyyy", "date-ddmmyyyy", "time-24-hour", "time-12-hour", "iso-8601-datetime", "unix-timestamp" ] }, { "slug": "date-mmddyyyy", "name": "Date (MM/DD/YYYY)", "category": "Date & Time", "pattern": "^(0[1-9]|1[0-2])\\/(0[1-9]|[12]\\d|3[01])\\/\\d{4}$", "flags": "", "testMatch": "03/07/2026", "testNoMatch": "13/07/2026", "language": "Universal", "useCase": "US date format validation, form inputs, data parsing", "difficulty": "Intermediate", "description": "Validates dates in US format (MM/DD/YYYY). Ensures month is 01-12 and day is 01-31.", "related": [ "date-yyyy-mm-dd", "date-ddmmyyyy", "time-24-hour", "time-12-hour", "iso-8601-datetime", "unix-timestamp" ] }, { "slug": "date-ddmmyyyy", "name": "Date (DD/MM/YYYY)", "category": "Date & Time", "pattern": "^(0[1-9]|[12]\\d|3[01])\\/(0[1-9]|1[0-2])\\/\\d{4}$", "flags": "", "testMatch": "07/03/2026", "testNoMatch": "32/01/2026", "language": "Universal", "useCase": "European/international date validation, localization", "difficulty": "Intermediate", "description": "Validates dates in day-first format common in Europe and most of the world. Day 01-31, month 01-12.", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "time-24-hour", "time-12-hour", "iso-8601-datetime", "unix-timestamp" ] }, { "slug": "time-24-hour", "name": "Time (24-hour)", "category": "Date & Time", "pattern": "^([01]\\d|2[0-3]):[0-5]\\d(:[0-5]\\d)?$", "flags": "", "testMatch": "23:59:59", "testNoMatch": "24:00", "language": "Universal", "useCase": "Time input validation, scheduling, log timestamps", "difficulty": "Beginner", "description": "Validates 24-hour time format (HH:MM or HH:MM:SS). Hours 00-23, minutes and seconds 00-59.", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "date-ddmmyyyy", "time-12-hour", "iso-8601-datetime", "unix-timestamp" ] }, { "slug": "time-12-hour", "name": "Time (12-hour)", "category": "Date & Time", "pattern": "^(0?[1-9]|1[0-2]):[0-5]\\d\\s?[AaPp][Mm]$", "flags": "", "testMatch": "2:30 PM", "testNoMatch": "13:00 PM", "language": "Universal", "useCase": "US time display, scheduling apps, time picker validation", "difficulty": "Beginner", "description": "Validates 12-hour time with AM/PM indicator. Hours 1-12, minutes 00-59, with flexible spacing.", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "date-ddmmyyyy", "time-24-hour", "iso-8601-datetime", "unix-timestamp" ] }, { "slug": "iso-8601-datetime", "name": "ISO 8601 DateTime", "category": "Date & Time", "pattern": "^\\d{4}-\\d{2}-\\d{2}T\\d{2}:\\d{2}:\\d{2}(\\.\\d+)?(Z|[+-]\\d{2}:\\d{2})?$", "flags": "", "testMatch": "2026-03-07T14:30:00Z", "testNoMatch": "2026-03-07 14:30:00", "language": "Universal", "useCase": "API timestamps, logging, database datetime fields", "difficulty": "Advanced", "description": "Validates full ISO 8601 datetime strings with optional milliseconds and timezone offset (Z or +/-HH:MM).", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "date-ddmmyyyy", "time-24-hour", "time-12-hour", "unix-timestamp" ] }, { "slug": "unix-timestamp", "name": "Unix Timestamp", "category": "Date & Time", "pattern": "^\\d{10,13}$", "flags": "", "testMatch": "1678185600000", "testNoMatch": "123456789", "language": "Universal", "useCase": "API responses, database records, log analysis", "difficulty": "Beginner", "description": "Matches Unix timestamps in seconds (10 digits) or milliseconds (13 digits). Used universally in programming.", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "date-ddmmyyyy", "time-24-hour", "time-12-hour", "iso-8601-datetime" ] }, { "slug": "relative-date", "name": "Relative Date", "category": "Date & Time", "pattern": "^\\d+\\s+(second|minute|hour|day|week|month|year)s?\\s+(ago|from now)$", "flags": "i", "testMatch": "5 days ago", "testNoMatch": "yesterday", "language": "Universal", "useCase": "Natural language date parsing, social media timestamps, UX", "difficulty": "Intermediate", "description": "Matches relative time expressions like \"5 minutes ago\" or \"3 months from now\" for human-readable timestamps.", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "date-ddmmyyyy", "time-24-hour", "time-12-hour", "iso-8601-datetime" ] }, { "slug": "duration-hh-mm-ss", "name": "Duration (HH:MM:SS)", "category": "Date & Time", "pattern": "^\\d+:[0-5]\\d:[0-5]\\d$", "flags": "", "testMatch": "01:30:45", "testNoMatch": "1:60:00", "language": "Universal", "useCase": "Video duration, timer display, time tracking", "difficulty": "Beginner", "description": "Validates time duration format with hours (any count), minutes (00-59), and seconds (00-59).", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "date-ddmmyyyy", "time-24-hour", "time-12-hour", "iso-8601-datetime" ] }, { "slug": "cron-expression", "name": "Cron Expression", "category": "Date & Time", "pattern": "^(\\*|\\d+|\\d+-\\d+|\\d+\\/\\d+)(\\s+(\\*|\\d+|\\d+-\\d+|\\d+\\/\\d+)){4}$", "flags": "", "testMatch": "0 */6 * * *", "testNoMatch": "0 0", "language": "Universal", "useCase": "Task scheduling, CI/CD pipelines, system administration", "difficulty": "Advanced", "description": "Validates standard 5-field cron expressions (minute, hour, day, month, weekday) with wildcards and ranges.", "related": [ "date-yyyy-mm-dd", "date-mmddyyyy", "date-ddmmyyyy", "time-24-hour", "time-12-hour", "iso-8601-datetime" ] }, { "slug": "username", "name": "Username", "category": "Text & Strings", "pattern": "^[a-zA-Z0-9_-]{3,20}$", "flags": "", "testMatch": "cool_user123", "testNoMatch": "ab", "language": "Universal", "useCase": "User registration, profile validation, social media handles", "difficulty": "Beginner", "description": "Validates usernames with letters, numbers, underscores, and hyphens. Length 3-20 characters.", "related": [ "strong-password", "slug-url-friendly", "hashtag", "html-tag", "html-comments", "quoted-string" ] }, { "slug": "strong-password", "name": "Strong Password", "category": "Text & Strings", "pattern": "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[@$!%*?&])[A-Za-z\\d@$!%*?&]{8,}$", "flags": "", "testMatch": "Pass@word1", "testNoMatch": "password", "language": "Universal", "useCase": "Registration forms, password policy enforcement, security audits", "difficulty": "Intermediate", "description": "Enforces strong password policy: minimum 8 characters with at least one uppercase, lowercase, digit, and special character.", "related": [ "username", "slug-url-friendly", "hashtag", "html-tag", "html-comments", "quoted-string" ] }, { "slug": "slug-url-friendly", "name": "Slug (URL-friendly)", "category": "Text & Strings", "pattern": "^[a-z0-9]+(-[a-z0-9]+)*$", "flags": "", "testMatch": "my-blog-post-2026", "testNoMatch": "My Blog Post", "language": "Universal", "useCase": "URL generation, SEO, CMS, blog platforms", "difficulty": "Beginner", "description": "Validates URL-friendly slugs with lowercase letters, numbers, and hyphens. No consecutive or trailing hyphens.", "related": [ "username", "strong-password", "hashtag", "html-tag", "html-comments", "quoted-string" ] }, { "slug": "hashtag", "name": "Hashtag", "category": "Text & Strings", "pattern": "#[a-zA-Z][a-zA-Z0-9_]*", "flags": "g", "testMatch": "#JavaScript #coding", "testNoMatch": "#123", "language": "Universal", "useCase": "Social media parsing, content tagging, trend analysis", "difficulty": "Beginner", "description": "Extracts hashtags starting with # followed by a letter and optional alphanumeric/underscore characters.", "related": [ "username", "strong-password", "slug-url-friendly", "html-tag", "html-comments", "quoted-string" ] }, { "slug": "html-tag", "name": "HTML Tag", "category": "Text & Strings", "pattern": "<\\/?[a-zA-Z][a-zA-Z0-9]*\\b[^>]*>", "flags": "g", "testMatch": "
", "testNoMatch": "<123>", "language": "Universal", "useCase": "HTML parsing, sanitization, template processing, web scraping", "difficulty": "Intermediate", "description": "Matches opening and closing HTML tags with optional attributes. Useful for HTML manipulation and content extraction.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-comments", "quoted-string" ] }, { "slug": "html-comments", "name": "HTML Comments", "category": "Text & Strings", "pattern": "", "flags": "g", "testMatch": "", "testNoMatch": "", "language": "Universal", "useCase": "Code cleanup, template processing, build tools", "difficulty": "Beginner", "description": "Matches HTML comments including multi-line content. Used for stripping comments during minification or processing.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-tag", "quoted-string" ] }, { "slug": "quoted-string", "name": "Quoted String", "category": "Text & Strings", "pattern": "([\"'])(?:(?!\\1|\\\\).|\\\\.)*\\1", "flags": "g", "testMatch": "\"hello world\"", "testNoMatch": "\"unclosed", "language": "Universal", "useCase": "Syntax highlighting, code parsing, string extraction", "difficulty": "Advanced", "description": "Matches single or double-quoted strings with proper escape handling. Handles escaped quotes within strings.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-tag", "html-comments" ] }, { "slug": "markdown-link", "name": "Markdown Link", "category": "Text & Strings", "pattern": "\\[([^\\]]+)\\]\\(([^)]+)\\)", "flags": "g", "testMatch": "[Click here](https://example.com)", "testNoMatch": "[broken(link]", "language": "Universal", "useCase": "Markdown parsing, documentation processing, link extraction", "difficulty": "Intermediate", "description": "Matches Markdown inline links capturing both the display text and URL. Essential for Markdown-to-HTML converters.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-tag", "html-comments" ] }, { "slug": "markdown-heading", "name": "Markdown Heading", "category": "Text & Strings", "pattern": "^(#{1,6})\\s+(.+)$", "flags": "gm", "testMatch": "## My Heading", "testNoMatch": "####### H7", "language": "Universal", "useCase": "Table of contents generation, document structure analysis", "difficulty": "Beginner", "description": "Matches Markdown headings H1-H6. Captures the level (number of #) and heading text.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-tag", "html-comments" ] }, { "slug": "whitespace-trimmer", "name": "Whitespace Trimmer", "category": "Text & Strings", "pattern": "^\\s+|\\s+$", "flags": "gm", "testMatch": " hello ", "testNoMatch": "hello", "language": "Universal", "useCase": "Text cleanup, input sanitization, data normalization", "difficulty": "Beginner", "description": "Matches leading and trailing whitespace for trimming. Equivalent to the trim() method in most languages.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-tag", "html-comments" ] }, { "slug": "duplicate-words", "name": "Duplicate Words", "category": "Text & Strings", "pattern": "\\b(\\w+)\\s+\\1\\b", "flags": "gi", "testMatch": "the the", "testNoMatch": "the there", "language": "Universal", "useCase": "Proofreading, text quality checking, content editing", "difficulty": "Intermediate", "description": "Detects consecutively repeated words like \"the the\" or \"is is\". Useful for proofreading and text cleanup.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-tag", "html-comments" ] }, { "slug": "sentence", "name": "Sentence", "category": "Text & Strings", "pattern": "[A-Z][^.!?]*[.!?]", "flags": "g", "testMatch": "This is a sentence.", "testNoMatch": "not a sentence", "language": "Universal", "useCase": "NLP preprocessing, text splitting, content analysis", "difficulty": "Beginner", "description": "Matches sentences starting with a capital letter and ending with period, exclamation, or question mark.", "related": [ "username", "strong-password", "slug-url-friendly", "hashtag", "html-tag", "html-comments" ] }, { "slug": "javascript-variable", "name": "JavaScript Variable", "category": "Code & Programming", "pattern": "\\b(const|let|var)\\s+([a-zA-Z_$][a-zA-Z0-9_$]*)\\b", "flags": "g", "testMatch": "const myVar = 5", "testNoMatch": "function foo", "language": "JavaScript", "useCase": "Code analysis, linting, refactoring tools", "difficulty": "Intermediate", "description": "Matches JavaScript variable declarations (const, let, var) and captures the variable name.", "related": [ "javascript-function", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement", "json-key-value-pair" ] }, { "slug": "javascript-function", "name": "JavaScript Function", "category": "Code & Programming", "pattern": "\\bfunction\\s+([a-zA-Z_$][a-zA-Z0-9_$]*)\\s*\\(", "flags": "g", "testMatch": "function calculateTax(", "testNoMatch": "const fn = () =>", "language": "JavaScript", "useCase": "Code indexing, documentation generation, IDE features", "difficulty": "Intermediate", "description": "Matches named function declarations in JavaScript, capturing the function name.", "related": [ "javascript-variable", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement", "json-key-value-pair" ] }, { "slug": "css-hex-color", "name": "CSS Hex Color", "category": "Code & Programming", "pattern": "#([0-9a-fA-F]{3}){1,2}\\b", "flags": "g", "testMatch": "#FF5733", "testNoMatch": "#GG5733", "language": "CSS", "useCase": "Design tools, theme extraction, CSS processing", "difficulty": "Beginner", "description": "Matches 3 or 6-digit hex color codes. Commonly used to extract or validate colors from CSS stylesheets.", "related": [ "javascript-variable", "javascript-function", "css-class-selector", "python-import", "sql-select-statement", "json-key-value-pair" ] }, { "slug": "css-class-selector", "name": "CSS Class Selector", "category": "Code & Programming", "pattern": "\\.[a-zA-Z_][a-zA-Z0-9_-]*", "flags": "g", "testMatch": ".my-class", "testNoMatch": "#myId", "language": "CSS", "useCase": "CSS analysis, class extraction, style auditing", "difficulty": "Beginner", "description": "Matches CSS class selectors starting with a dot. Captures class names from stylesheets for analysis.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "python-import", "sql-select-statement", "json-key-value-pair" ] }, { "slug": "python-import", "name": "Python Import", "category": "Code & Programming", "pattern": "^(?:from\\s+[\\w.]+\\s+)?import\\s+[\\w.,\\s]+$", "flags": "gm", "testMatch": "from os.path import join", "testNoMatch": "const import = 5", "language": "Python", "useCase": "Dependency analysis, code refactoring, import sorting", "difficulty": "Intermediate", "description": "Matches Python import statements including `import` and `from...import` forms for dependency tracking.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "sql-select-statement", "json-key-value-pair" ] }, { "slug": "sql-select-statement", "name": "SQL SELECT Statement", "category": "Code & Programming", "pattern": "\\bSELECT\\b[\\s\\S]+?\\bFROM\\b\\s+\\w+", "flags": "gi", "testMatch": "SELECT * FROM users", "testNoMatch": "INSERT INTO users", "language": "SQL", "useCase": "Query logging, SQL injection detection, query optimization", "difficulty": "Intermediate", "description": "Matches SQL SELECT queries extracting the table name from the FROM clause. Useful for query analysis and logging.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "python-import", "json-key-value-pair" ] }, { "slug": "json-key-value-pair", "name": "JSON Key-Value Pair", "category": "Code & Programming", "pattern": "\"([^\"]+)\"\\s*:\\s*(\"([^\"]*)\"|\\d+|true|false|null)", "flags": "g", "testMatch": "\"name\": \"John\"", "testNoMatch": "{invalid}", "language": "JSON", "useCase": "JSON parsing, data extraction, API response processing", "difficulty": "Intermediate", "description": "Matches JSON key-value pairs with string, number, boolean, or null values. Useful for lightweight JSON processing.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement" ] }, { "slug": "todo-comment", "name": "TODO Comment", "category": "Code & Programming", "pattern": "\\/\\/\\s*(TODO|FIXME|HACK|XXX|BUG):\\s*(.+)$", "flags": "gm", "testMatch": "// TODO: Fix this later", "testNoMatch": "// Regular comment", "language": "Universal", "useCase": "Code review, technical debt tracking, IDE integration", "difficulty": "Beginner", "description": "Extracts TODO, FIXME, HACK, XXX, and BUG comments from source code for task tracking.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement" ] }, { "slug": "semantic-version", "name": "Semantic Version", "category": "Code & Programming", "pattern": "^(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(-[a-zA-Z0-9.]+)?(\\+[a-zA-Z0-9.]+)?$", "flags": "", "testMatch": "2.1.0-beta.1", "testNoMatch": "1.2", "language": "Universal", "useCase": "Package management, CI/CD, release automation", "difficulty": "Intermediate", "description": "Validates semantic version strings (SemVer) with major.minor.patch and optional pre-release and build metadata.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement" ] }, { "slug": "git-commit-hash", "name": "Git Commit Hash", "category": "Code & Programming", "pattern": "^[0-9a-f]{7,40}$", "flags": "", "testMatch": "a1b2c3d", "testNoMatch": "xyz1234", "language": "Universal", "useCase": "Git automation, CI/CD pipelines, commit referencing", "difficulty": "Beginner", "description": "Matches Git commit SHA hashes in both short (7 chars) and full (40 chars) formats.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement" ] }, { "slug": "environment-variable", "name": "Environment Variable", "category": "Code & Programming", "pattern": "^[A-Z][A-Z0-9_]*=.+$", "flags": "gm", "testMatch": "DATABASE_URL=postgres://localhost", "testNoMatch": "lowercase=value", "language": "Universal", "useCase": ".env file parsing, configuration management, deployment", "difficulty": "Beginner", "description": "Matches environment variable assignments in KEY=VALUE format with uppercase keys and underscores.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement" ] }, { "slug": "import-path", "name": "Import Path", "category": "Code & Programming", "pattern": "['\"]([./]\\S+?)['\"]", "flags": "g", "testMatch": "import x from './utils'", "testNoMatch": "import 'react'", "language": "Universal", "useCase": "Dependency graph, path resolution, bundle analysis", "difficulty": "Intermediate", "description": "Extracts relative import paths from JavaScript/TypeScript import and require statements.", "related": [ "javascript-variable", "javascript-function", "css-hex-color", "css-class-selector", "python-import", "sql-select-statement" ] }, { "slug": "jwt-token", "name": "JWT Token", "category": "Security & Auth", "pattern": "^[A-Za-z0-9_-]+\\.[A-Za-z0-9_-]+\\.[A-Za-z0-9_-]+$", "flags": "", "testMatch": "eyJhbG.eyJzdW.SflKxw", "testNoMatch": "not.a.jwt.token", "language": "Universal", "useCase": "Token validation, API authentication, security auditing", "difficulty": "Intermediate", "description": "Validates JWT (JSON Web Token) structure with three Base64URL-encoded segments separated by dots.", "related": [ "uuid-v4", "api-key-pattern", "aws-access-key", "base64-encoded-string", "md5-hash", "sha-256-hash" ] }, { "slug": "uuid-v4", "name": "UUID (v4)", "category": "Security & Auth", "pattern": "^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$", "flags": "i", "testMatch": "550e8400-e29b-41d4-a716-446655440000", "testNoMatch": "550e8400-e29b-51d4-a716-446655440000", "language": "Universal", "useCase": "ID validation, database records, API responses", "difficulty": "Intermediate", "description": "Validates UUID version 4 format with the version nibble (4) and variant bits (8, 9, a, b) in correct positions.", "related": [ "jwt-token", "api-key-pattern", "aws-access-key", "base64-encoded-string", "md5-hash", "sha-256-hash" ] }, { "slug": "api-key-pattern", "name": "API Key Pattern", "category": "Security & Auth", "pattern": "(?:api[_-]?key|apikey|token)[\\s]*[=:][\\s]*[\"']?([a-zA-Z0-9_-]{20,})[\"']?", "flags": "gi", "testMatch": "api_key=\"sk_live_abc123def456ghi789\"", "testNoMatch": "name=John", "language": "Universal", "useCase": "Secret scanning, code review, security auditing", "difficulty": "Advanced", "description": "Detects potential API keys and tokens in source code. Used by security tools to prevent accidental secret exposure.", "related": [ "jwt-token", "uuid-v4", "aws-access-key", "base64-encoded-string", "md5-hash", "sha-256-hash" ] }, { "slug": "aws-access-key", "name": "AWS Access Key", "category": "Security & Auth", "pattern": "(?:AKIA|ABIA|ACCA|ASIA)[0-9A-Z]{16}", "flags": "", "testMatch": "AKIAIOSFODNN7EXAMPLE", "testNoMatch": "BKIAIOSFODNN7EXAMPLE", "language": "Universal", "useCase": "Secret detection, security scanning, compliance checks", "difficulty": "Intermediate", "description": "Matches AWS access key IDs that always start with AKIA (long-term) or ASIA (temporary STS) followed by 16 uppercase alphanumeric characters.", "related": [ "jwt-token", "uuid-v4", "api-key-pattern", "base64-encoded-string", "md5-hash", "sha-256-hash" ] }, { "slug": "base64-encoded-string", "name": "Base64 Encoded String", "category": "Security & Auth", "pattern": "^[A-Za-z0-9+/]+={0,2}$", "flags": "", "testMatch": "SGVsbG8gV29ybGQ=", "testNoMatch": "not base64!!!", "language": "Universal", "useCase": "Data encoding validation, API payloads, image embedding", "difficulty": "Beginner", "description": "Validates Base64-encoded strings with proper character set and optional padding. Used in data transfer and encoding.", "related": [ "jwt-token", "uuid-v4", "api-key-pattern", "aws-access-key", "md5-hash", "sha-256-hash" ] }, { "slug": "md5-hash", "name": "MD5 Hash", "category": "Security & Auth", "pattern": "^[a-f0-9]{32}$", "flags": "i", "testMatch": "d41d8cd98f00b204e9800998ecf8427e", "testNoMatch": "d41d8cd98f00b204", "language": "Universal", "useCase": "Checksum verification, file integrity, legacy password hashing", "difficulty": "Beginner", "description": "Matches MD5 hash strings (32 hexadecimal characters). Used for checksums and file integrity verification.", "related": [ "jwt-token", "uuid-v4", "api-key-pattern", "aws-access-key", "base64-encoded-string", "sha-256-hash" ] }, { "slug": "sha-256-hash", "name": "SHA-256 Hash", "category": "Security & Auth", "pattern": "^[a-f0-9]{64}$", "flags": "i", "testMatch": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", "testNoMatch": "e3b0c44298fc1c14", "language": "Universal", "useCase": "File verification, blockchain, digital signatures", "difficulty": "Beginner", "description": "Matches SHA-256 hash strings (64 hexadecimal characters). Standard for modern cryptographic applications.", "related": [ "jwt-token", "uuid-v4", "api-key-pattern", "aws-access-key", "base64-encoded-string", "md5-hash" ] }, { "slug": "ssh-public-key", "name": "SSH Public Key", "category": "Security & Auth", "pattern": "^ssh-(rsa|ed25519|ecdsa)\\s+[A-Za-z0-9+/=]+", "flags": "", "testMatch": "ssh-rsa AAAAB3NzaC1yc2EAAA...", "testNoMatch": "not-ssh-key", "language": "Universal", "useCase": "SSH key management, server configuration, git authentication", "difficulty": "Intermediate", "description": "Matches SSH public key format with algorithm prefix (rsa, ed25519, ecdsa) followed by Base64-encoded key data.", "related": [ "jwt-token", "uuid-v4", "api-key-pattern", "aws-access-key", "base64-encoded-string", "md5-hash" ] }, { "slug": "json-object", "name": "JSON Object", "category": "Data Formats", "pattern": "\\{[\\s\\S]*\\}", "flags": "", "testMatch": "{\"key\": \"value\"}", "testNoMatch": "[1,2,3]", "language": "Universal", "useCase": "JSON detection, API response parsing, log analysis", "difficulty": "Beginner", "description": "Matches JSON object patterns enclosed in curly braces. Simple detection pattern for JSON objects in text.", "related": [ "csv-row", "xml-tag-with-content", "yaml-key-value", "log-entry-common-log-format", "ini-section", "toml-key-value" ] }, { "slug": "csv-row", "name": "CSV Row", "category": "Data Formats", "pattern": "^(\"(?:[^\"]|\"\")*\"|[^,]*)(,(\"(?:[^\"]|\"\")*\"|[^,]*))*$", "flags": "gm", "testMatch": "\"John\",\"Doe\",30", "testNoMatch": "", "language": "Universal", "useCase": "CSV parsing, data import, spreadsheet processing", "difficulty": "Advanced", "description": "Matches CSV rows handling quoted fields with escaped quotes. Essential for robust CSV file processing.", "related": [ "json-object", "xml-tag-with-content", "yaml-key-value", "log-entry-common-log-format", "ini-section", "toml-key-value" ] }, { "slug": "xml-tag-with-content", "name": "XML Tag with Content", "category": "Data Formats", "pattern": "<(\\w+)[^>]*>(.*?)<\\/\\1>", "flags": "gs", "testMatch": "John", "testNoMatch": "
", "language": "Universal", "useCase": "XML parsing, data extraction, SOAP processing", "difficulty": "Intermediate", "description": "Matches XML elements with opening tag, content, and matching closing tag. Captures tag name and inner content.", "related": [ "json-object", "csv-row", "yaml-key-value", "log-entry-common-log-format", "ini-section", "toml-key-value" ] }, { "slug": "yaml-key-value", "name": "YAML Key-Value", "category": "Data Formats", "pattern": "^([\\w.-]+):\\s+(.+)$", "flags": "gm", "testMatch": "name: John Doe", "testNoMatch": "- list item", "language": "Universal", "useCase": "Configuration parsing, Docker Compose, Kubernetes manifests", "difficulty": "Beginner", "description": "Matches simple YAML key-value pairs. Useful for quick parsing of configuration files.", "related": [ "json-object", "csv-row", "xml-tag-with-content", "log-entry-common-log-format", "ini-section", "toml-key-value" ] }, { "slug": "log-entry-common-log-format", "name": "Log Entry (Common Log Format)", "category": "Data Formats", "pattern": "^(\\S+)\\s+(\\S+)\\s+(\\S+)\\s+\\[([^\\]]+)\\]\\s+\"(\\S+)\\s+(\\S+)\\s+(\\S+)\"\\s+(\\d+)\\s+(\\d+)", "flags": "gm", "testMatch": "127.0.0.1 - - [07/Mar/2026:14:00:00 +0000] \"GET /index.html HTTP/1.1\" 200 1234", "testNoMatch": "random text", "language": "Universal", "useCase": "Log analysis, monitoring, security investigation", "difficulty": "Advanced", "description": "Parses Apache/Nginx Common Log Format entries, extracting IP, timestamp, method, path, status code, and bytes.", "related": [ "json-object", "csv-row", "xml-tag-with-content", "yaml-key-value", "ini-section", "toml-key-value" ] }, { "slug": "ini-section", "name": "INI Section", "category": "Data Formats", "pattern": "^\\[([^\\]]+)\\]$", "flags": "gm", "testMatch": "[database]", "testNoMatch": "key=value", "language": "Universal", "useCase": "Configuration file parsing, INI processing, settings management", "difficulty": "Beginner", "description": "Matches INI file section headers enclosed in square brackets. Used for parsing configuration files.", "related": [ "json-object", "csv-row", "xml-tag-with-content", "yaml-key-value", "log-entry-common-log-format", "toml-key-value" ] }, { "slug": "toml-key-value", "name": "TOML Key-Value", "category": "Data Formats", "pattern": "^([a-zA-Z_][a-zA-Z0-9_]*)\\s*=\\s*(.+)$", "flags": "gm", "testMatch": "port = 8080", "testNoMatch": "# comment", "language": "Universal", "useCase": "Cargo.toml parsing, config management, Rust ecosystem", "difficulty": "Beginner", "description": "Matches TOML configuration key-value pairs. Standard format for Rust (Cargo) and Python (pyproject) projects.", "related": [ "json-object", "csv-row", "xml-tag-with-content", "yaml-key-value", "log-entry-common-log-format", "ini-section" ] }, { "slug": "sql-comment", "name": "SQL Comment", "category": "Data Formats", "pattern": "--.*$|\\/\\*[\\s\\S]*?\\*\\/", "flags": "gm", "testMatch": "-- This is a comment", "testNoMatch": "SELECT * FROM t", "language": "SQL", "useCase": "SQL cleanup, query extraction, code documentation", "difficulty": "Intermediate", "description": "Matches both single-line (--) and multi-line (/* */) SQL comments for stripping or extracting documentation.", "related": [ "json-object", "csv-row", "xml-tag-with-content", "yaml-key-value", "log-entry-common-log-format", "ini-section" ] }, { "slug": "docker-image-reference", "name": "Docker Image Reference", "category": "Data Formats", "pattern": "^([a-z0-9._-]+\\/)?[a-z0-9._-]+(:[a-zA-Z0-9._-]+)?(@sha256:[a-f0-9]{64})?$", "flags": "", "testMatch": "nginx:latest", "testNoMatch": "INVALID IMAGE", "language": "Universal", "useCase": "Dockerfile linting, container orchestration, CI/CD", "difficulty": "Intermediate", "description": "Validates Docker image references with optional registry, tag, and digest. Used in Dockerfiles and compose files.", "related": [ "json-object", "csv-row", "xml-tag-with-content", "yaml-key-value", "log-entry-common-log-format", "ini-section" ] }, { "slug": "file-path-unix", "name": "File Path (Unix)", "category": "Data Formats", "pattern": "^\\/(?:[a-zA-Z0-9._-]+\\/?)*$", "flags": "", "testMatch": "/usr/local/bin/node", "testNoMatch": "C:\\Windows", "language": "Universal", "useCase": "Path validation, file system operations, log parsing", "difficulty": "Beginner", "description": "Matches absolute Unix/Linux file paths starting with forward slash. Validates path component characters.", "related": [ "json-object", "csv-row", "xml-tag-with-content", "yaml-key-value", "log-entry-common-log-format", "ini-section" ] }, { "slug": "email-in-text", "name": "Email in Text", "category": "Web & HTML", "pattern": "[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}", "flags": "g", "testMatch": "Contact: user@example.com for info", "testNoMatch": "no email here", "language": "Universal", "useCase": "Data mining, contact extraction, web scraping", "difficulty": "Beginner", "description": "Extracts email addresses from body text. Non-anchored version for finding emails within larger strings.", "related": [ "image-tag-src", "anchor-tag-href", "meta-tag-content", "inline-css-style", "youtube-video-id", "twitterx-handle" ] }, { "slug": "image-tag-src", "name": "Image Tag (src)", "category": "Web & HTML", "pattern": "]+src=[\"']([^\"']+)[\"']", "flags": "gi", "testMatch": "\"Photo\"", "testNoMatch": "
no image
", "language": "HTML", "useCase": "Image extraction, SEO auditing, accessibility checking", "difficulty": "Intermediate", "description": "Extracts image source URLs from HTML img tags. Useful for web scraping, SEO image audits, and content migration.", "related": [ "email-in-text", "anchor-tag-href", "meta-tag-content", "inline-css-style", "youtube-video-id", "twitterx-handle" ] }, { "slug": "anchor-tag-href", "name": "Anchor Tag (href)", "category": "Web & HTML", "pattern": "]+href=[\"']([^\"']+)[\"']", "flags": "gi", "testMatch": "About", "testNoMatch": "text", "language": "HTML", "useCase": "Link extraction, site crawling, SEO link auditing", "difficulty": "Intermediate", "description": "Extracts URLs from HTML anchor tags. Essential for web crawlers, SEO tools, and broken link checkers.", "related": [ "email-in-text", "image-tag-src", "meta-tag-content", "inline-css-style", "youtube-video-id", "twitterx-handle" ] }, { "slug": "meta-tag-content", "name": "Meta Tag Content", "category": "Web & HTML", "pattern": "]+content=[\"']([^\"']+)[\"']", "flags": "gi", "testMatch": "", "testNoMatch": "Page", "language": "HTML", "useCase": "SEO analysis, social media preview, metadata extraction", "difficulty": "Intermediate", "description": "Extracts content attribute values from HTML meta tags for SEO auditing and metadata analysis.", "related": [ "email-in-text", "image-tag-src", "anchor-tag-href", "inline-css-style", "youtube-video-id", "twitterx-handle" ] }, { "slug": "inline-css-style", "name": "Inline CSS Style", "category": "Web & HTML", "pattern": "style=[\"']([^\"']+)[\"']", "flags": "gi", "testMatch": "
", "testNoMatch": "
", "language": "HTML", "useCase": "Code cleanup, CSS extraction, linting", "difficulty": "Beginner", "description": "Matches inline CSS style attributes on HTML elements. Used for style extraction and converting inline styles to classes.", "related": [ "email-in-text", "image-tag-src", "anchor-tag-href", "meta-tag-content", "youtube-video-id", "twitterx-handle" ] }, { "slug": "youtube-video-id", "name": "YouTube Video ID", "category": "Web & HTML", "pattern": "(?:youtube\\.com\\/watch\\?v=|youtu\\.be\\/|youtube\\.com\\/embed\\/)([a-zA-Z0-9_-]{11})", "flags": "g", "testMatch": "https://www.youtube.com/watch?v=dQw4w9WgXcQ", "testNoMatch": "https://vimeo.com/123", "language": "Universal", "useCase": "Video embedding, content curation, social media tools", "difficulty": "Intermediate", "description": "Extracts 11-character YouTube video IDs from various URL formats including standard, shortened, and embed URLs.", "related": [ "email-in-text", "image-tag-src", "anchor-tag-href", "meta-tag-content", "inline-css-style", "twitterx-handle" ] }, { "slug": "twitterx-handle", "name": "Twitter/X Handle", "category": "Web & HTML", "pattern": "@([a-zA-Z0-9_]{1,15})\\b", "flags": "g", "testMatch": "@elonmusk", "testNoMatch": "@ spaces", "language": "Universal", "useCase": "Social media monitoring, mention tracking, user tagging", "difficulty": "Beginner", "description": "Matches Twitter/X handles with @ prefix and 1-15 alphanumeric characters or underscores.", "related": [ "email-in-text", "image-tag-src", "anchor-tag-href", "meta-tag-content", "inline-css-style", "youtube-video-id" ] }, { "slug": "github-repository-url", "name": "GitHub Repository URL", "category": "Web & HTML", "pattern": "github\\.com\\/([a-zA-Z0-9_.-]+)\\/([a-zA-Z0-9_.-]+)", "flags": "g", "testMatch": "https://github.com/facebook/react", "testNoMatch": "https://gitlab.com/user/repo", "language": "Universal", "useCase": "Open source tracking, dependency analysis, documentation", "difficulty": "Beginner", "description": "Extracts owner and repository name from GitHub URLs. Used in dependency management and open source tooling.", "related": [ "email-in-text", "image-tag-src", "anchor-tag-href", "meta-tag-content", "inline-css-style", "youtube-video-id" ] }, { "slug": "css-media-query", "name": "CSS Media Query", "category": "Web & HTML", "pattern": "@media\\s*\\([^)]+\\)\\s*\\{", "flags": "g", "testMatch": "@media (max-width: 768px) {", "testNoMatch": ".class { }", "language": "CSS", "useCase": "Responsive design analysis, CSS auditing, style extraction", "difficulty": "Intermediate", "description": "Matches CSS media query declarations for responsive design. Extracts breakpoints and conditions from stylesheets.", "related": [ "email-in-text", "image-tag-src", "anchor-tag-href", "meta-tag-content", "inline-css-style", "youtube-video-id" ] }, { "slug": "data-attribute", "name": "Data Attribute", "category": "Web & HTML", "pattern": "data-([a-z-]+)=[\"']([^\"']*)[\"']", "flags": "gi", "testMatch": "data-user-id=\"123\"", "testNoMatch": "class=\"test\"", "language": "HTML", "useCase": "DOM manipulation, JavaScript frameworks, testing selectors", "difficulty": "Beginner", "description": "Matches HTML5 data attributes (data-*) and captures both the attribute name and value.", "related": [ "email-in-text", "image-tag-src", "anchor-tag-href", "meta-tag-content", "inline-css-style", "youtube-video-id" ] }, { "slug": "file-extension", "name": "File Extension", "category": "File & Path", "pattern": "\\.(\\w{1,10})$", "flags": "", "testMatch": "document.pdf", "testNoMatch": "noextension", "language": "Universal", "useCase": "File type detection, upload validation, file sorting", "difficulty": "Beginner", "description": "Extracts file extensions from filenames. Simple pattern for file type checking in upload forms.", "related": [ "image-file", "video-file", "file-path-windows", "mime-type", "s3-bucket-url" ] }, { "slug": "image-file", "name": "Image File", "category": "File & Path", "pattern": "\\.(jpe?g|png|gif|svg|webp|bmp|ico|tiff?)$", "flags": "i", "testMatch": "photo.jpg", "testNoMatch": "script.js", "language": "Universal", "useCase": "Upload validation, file filtering, media processing", "difficulty": "Beginner", "description": "Matches common image file extensions including JPEG, PNG, GIF, SVG, WebP, BMP, ICO, and TIFF.", "related": [ "file-extension", "video-file", "file-path-windows", "mime-type", "s3-bucket-url" ] }, { "slug": "video-file", "name": "Video File", "category": "File & Path", "pattern": "\\.(mp4|avi|mkv|mov|wmv|flv|webm|m4v|mpeg)$", "flags": "i", "testMatch": "video.mp4", "testNoMatch": "audio.mp3", "language": "Universal", "useCase": "Media upload validation, file management, streaming", "difficulty": "Beginner", "description": "Matches common video file extensions for upload validation and media file filtering.", "related": [ "file-extension", "image-file", "file-path-windows", "mime-type", "s3-bucket-url" ] }, { "slug": "file-path-windows", "name": "File Path (Windows)", "category": "File & Path", "pattern": "^[a-zA-Z]:\\\\(?:[^\\\\/:*?\"<>|]+\\\\)*[^\\\\/:*?\"<>|]*$", "flags": "", "testMatch": "C:\\Users\\Documents\\file.txt", "testNoMatch": "/usr/local/bin", "language": "Universal", "useCase": "Windows path validation, cross-platform tools, file operations", "difficulty": "Intermediate", "description": "Validates Windows file paths with drive letter, backslash separators, and restrictions on invalid characters.", "related": [ "file-extension", "image-file", "video-file", "mime-type", "s3-bucket-url" ] }, { "slug": "mime-type", "name": "MIME Type", "category": "File & Path", "pattern": "^(application|audio|font|image|message|model|multipart|text|video)\\/[a-zA-Z0-9][a-zA-Z0-9!#$&\\-^_.+]*$", "flags": "", "testMatch": "application/json", "testNoMatch": "invalid/type/extra", "language": "Universal", "useCase": "Content-Type validation, file upload handling, API headers", "difficulty": "Intermediate", "description": "Validates MIME type format with standard top-level types and subtypes. Used in HTTP headers and file handling.", "related": [ "file-extension", "image-file", "video-file", "file-path-windows", "s3-bucket-url" ] }, { "slug": "s3-bucket-url", "name": "S3 Bucket URL", "category": "File & Path", "pattern": "s3:\\/\\/([a-z0-9][a-z0-9.-]{1,61}[a-z0-9])(\\/.*)?", "flags": "", "testMatch": "s3://my-bucket/path/to/file.txt", "testNoMatch": "http://s3.amazonaws.com/bucket", "language": "Universal", "useCase": "AWS infrastructure, cloud storage, data pipelines", "difficulty": "Intermediate", "description": "Matches S3 protocol URLs with bucket name and optional path. Used in AWS CLI commands and data engineering.", "related": [ "file-extension", "image-file", "video-file", "file-path-windows", "mime-type" ] }, { "slug": "social-security-number-us", "name": "Social Security Number (US)", "category": "Identity & Documents", "pattern": "^\\d{3}-\\d{2}-\\d{4}$", "flags": "", "testMatch": "123-45-6789", "testNoMatch": "123-456-789", "language": "Universal", "useCase": "PII detection, data masking, compliance scanning", "difficulty": "Beginner", "description": "Matches US Social Security Numbers in standard XXX-XX-XXXX format. Used for PII detection and data masking.", "related": [ "us-zip-code", "us-state-code", "uk-postcode", "canadian-postal-code", "passport-number", "iban-number" ] }, { "slug": "us-zip-code", "name": "US Zip Code", "category": "Identity & Documents", "pattern": "^\\d{5}(-\\d{4})?$", "flags": "", "testMatch": "90210-1234", "testNoMatch": "1234", "language": "Universal", "useCase": "Address validation, shipping forms, location services", "difficulty": "Beginner", "description": "Validates US ZIP codes in 5-digit or ZIP+4 format. Essential for shipping and address validation forms.", "related": [ "social-security-number-us", "us-state-code", "uk-postcode", "canadian-postal-code", "passport-number", "iban-number" ] }, { "slug": "us-state-code", "name": "US State Code", "category": "Identity & Documents", "pattern": "^(A[KLRZ]|C[AOT]|D[CE]|FL|GA|HI|I[ADLN]|K[SY]|LA|M[ADEINOST]|N[CDEHJMVY]|O[HKR]|PA|RI|S[CD]|T[NX]|UT|V[AIT]|W[AIVY])$", "flags": "", "testMatch": "CA", "testNoMatch": "XX", "language": "Universal", "useCase": "Address forms, state selection validation, data cleaning", "difficulty": "Intermediate", "description": "Matches valid US state and DC two-letter abbreviations. Complete list of all 50 states plus District of Columbia.", "related": [ "social-security-number-us", "us-zip-code", "uk-postcode", "canadian-postal-code", "passport-number", "iban-number" ] }, { "slug": "uk-postcode", "name": "UK Postcode", "category": "Identity & Documents", "pattern": "^[A-Z]{1,2}\\d[A-Z\\d]?\\s?\\d[A-Z]{2}$", "flags": "i", "testMatch": "SW1A 1AA", "testNoMatch": "12345", "language": "Universal", "useCase": "UK address validation, shipping, location services", "difficulty": "Intermediate", "description": "Validates UK postcodes in various formats (A1 1AA, A11 1AA, AA1 1AA, etc.) with optional space.", "related": [ "social-security-number-us", "us-zip-code", "us-state-code", "canadian-postal-code", "passport-number", "iban-number" ] }, { "slug": "canadian-postal-code", "name": "Canadian Postal Code", "category": "Identity & Documents", "pattern": "^[A-Z]\\d[A-Z]\\s?\\d[A-Z]\\d$", "flags": "i", "testMatch": "K1A 0B1", "testNoMatch": "12345", "language": "Universal", "useCase": "Canadian address validation, shipping, geolocation", "difficulty": "Beginner", "description": "Validates Canadian postal codes in A1A 1A1 format alternating letters and digits with optional space.", "related": [ "social-security-number-us", "us-zip-code", "us-state-code", "uk-postcode", "passport-number", "iban-number" ] }, { "slug": "passport-number", "name": "Passport Number", "category": "Identity & Documents", "pattern": "^[A-Z]{1,2}\\d{6,9}$", "flags": "", "testMatch": "AB1234567", "testNoMatch": "123ABC", "language": "Universal", "useCase": "Travel document validation, KYC compliance, identity verification", "difficulty": "Beginner", "description": "Matches common passport number formats with 1-2 letter prefix followed by 6-9 digits.", "related": [ "social-security-number-us", "us-zip-code", "us-state-code", "uk-postcode", "canadian-postal-code", "iban-number" ] }, { "slug": "iban-number", "name": "IBAN Number", "category": "Identity & Documents", "pattern": "^[A-Z]{2}\\d{2}[A-Z0-9]{4}\\d{7}([A-Z0-9]?){0,16}$", "flags": "", "testMatch": "GB29NWBK60161331926819", "testNoMatch": "1234567890", "language": "Universal", "useCase": "Banking, international transfers, payment processing", "difficulty": "Advanced", "description": "Validates International Bank Account Numbers with country code, check digits, bank code, and account number.", "related": [ "social-security-number-us", "us-zip-code", "us-state-code", "uk-postcode", "canadian-postal-code", "passport-number" ] }, { "slug": "vin-vehicle-identification-number", "name": "VIN (Vehicle Identification Number)", "category": "Identity & Documents", "pattern": "^[A-HJ-NPR-Z0-9]{17}$", "flags": "", "testMatch": "1HGBH41JXMN109186", "testNoMatch": "AAABBB1234", "language": "Universal", "useCase": "Automotive, insurance, vehicle registration, fraud detection", "difficulty": "Intermediate", "description": "Validates 17-character Vehicle Identification Numbers excluding I, O, and Q which can be confused with 1 and 0.", "related": [ "social-security-number-us", "us-zip-code", "us-state-code", "uk-postcode", "canadian-postal-code", "passport-number" ] }, { "slug": "balanced-parentheses", "name": "Balanced Parentheses", "category": "Advanced Patterns", "pattern": "\\([^()]*\\)", "flags": "g", "testMatch": "(hello world)", "testNoMatch": "((unclosed)", "language": "Universal", "useCase": "Expression parsing, code analysis, mathematical expressions", "difficulty": "Intermediate", "description": "Matches innermost balanced parentheses groups. Note: regex alone cannot match nested groups — use recursive patterns or parsers.", "related": [ "lookahead-positive", "lookbehind-positive", "named-capture-groups", "non-greedy-matching", "atomic-group-simulation", "conditional-with-alternation" ] }, { "slug": "lookahead-positive", "name": "Lookahead (Positive)", "category": "Advanced Patterns", "pattern": "\\w+(?=\\s+is)", "flags": "g", "testMatch": "JavaScript is awesome", "testNoMatch": "JavaScript was great", "language": "Universal", "useCase": "Context-dependent matching, NLP, text analysis", "difficulty": "Advanced", "description": "Demonstrates positive lookahead: matches a word only if followed by \" is\". Lookaheads check without consuming characters.", "related": [ "balanced-parentheses", "lookbehind-positive", "named-capture-groups", "non-greedy-matching", "atomic-group-simulation", "conditional-with-alternation" ] }, { "slug": "lookbehind-positive", "name": "Lookbehind (Positive)", "category": "Advanced Patterns", "pattern": "(?<=\\$)\\d+(\\.\\d{2})?", "flags": "g", "testMatch": "Price: $49.99", "testNoMatch": "Price: 49.99", "language": "JavaScript", "useCase": "Price extraction, financial data parsing, currency processing", "difficulty": "Advanced", "description": "Demonstrates positive lookbehind: matches numbers only when preceded by $. Extracts prices without the dollar sign.", "related": [ "balanced-parentheses", "lookahead-positive", "named-capture-groups", "non-greedy-matching", "atomic-group-simulation", "conditional-with-alternation" ] }, { "slug": "named-capture-groups", "name": "Named Capture Groups", "category": "Advanced Patterns", "pattern": "(?\\d{4})-(?\\d{2})-(?\\d{2})", "flags": "", "testMatch": "2026-03-07", "testNoMatch": "March 7, 2026", "language": "JavaScript", "useCase": "Structured data extraction, code readability, date parsing", "difficulty": "Advanced", "description": "Demonstrates named capture groups for readable regex. Access matches by name instead of index for clearer code.", "related": [ "balanced-parentheses", "lookahead-positive", "lookbehind-positive", "non-greedy-matching", "atomic-group-simulation", "conditional-with-alternation" ] }, { "slug": "non-greedy-matching", "name": "Non-Greedy Matching", "category": "Advanced Patterns", "pattern": "<.+?>", "flags": "g", "testMatch": "bold", "testNoMatch": "no tags", "language": "Universal", "useCase": "HTML parsing, tag matching, minimal matching", "difficulty": "Intermediate", "description": "Shows non-greedy (lazy) matching with +? quantifier. Matches shortest possible string instead of longest.", "related": [ "balanced-parentheses", "lookahead-positive", "lookbehind-positive", "named-capture-groups", "atomic-group-simulation", "conditional-with-alternation" ] }, { "slug": "atomic-group-simulation", "name": "Atomic Group Simulation", "category": "Advanced Patterns", "pattern": "(?=(\\d+))\\1\\s", "flags": "g", "testMatch": "123 ", "testNoMatch": "abc ", "language": "JavaScript", "useCase": "Performance optimization, backtracking prevention", "difficulty": "Advanced", "description": "Simulates atomic groups in JavaScript using lookahead with backreference. Prevents catastrophic backtracking.", "related": [ "balanced-parentheses", "lookahead-positive", "lookbehind-positive", "named-capture-groups", "non-greedy-matching", "conditional-with-alternation" ] }, { "slug": "conditional-with-alternation", "name": "Conditional with Alternation", "category": "Advanced Patterns", "pattern": "(?:https?|ftp):\\/\\/\\S+", "flags": "g", "testMatch": "Visit ftp://files.example.com", "testNoMatch": "mailto:user@example.com", "language": "Universal", "useCase": "Protocol-specific URL matching, link classification", "difficulty": "Intermediate", "description": "Uses alternation within non-capturing group to match URLs with HTTP, HTTPS, or FTP protocols.", "related": [ "balanced-parentheses", "lookahead-positive", "lookbehind-positive", "named-capture-groups", "non-greedy-matching", "atomic-group-simulation" ] }, { "slug": "recursive-pattern-email-list", "name": "Recursive Pattern (Email List)", "category": "Advanced Patterns", "pattern": "[\\w.+-]+@[\\w-]+\\.[\\w.]+(?:\\s*,\\s*[\\w.+-]+@[\\w-]+\\.[\\w.]+)*", "flags": "", "testMatch": "a@b.com, c@d.com, e@f.com", "testNoMatch": "not,emails", "language": "Universal", "useCase": "Bulk email parsing, mailing list management, data import", "difficulty": "Advanced", "description": "Matches comma-separated email lists. Demonstrates pattern repetition for parsing delimited sequences.", "related": [ "balanced-parentheses", "lookahead-positive", "lookbehind-positive", "named-capture-groups", "non-greedy-matching", "atomic-group-simulation" ] }, { "slug": "sql-injection-basic", "name": "SQL Injection Pattern (Basic)", "category": "Security", "pattern": "(?:'\\s*(?:OR|AND)\\s+.*=.*|;\\s*(?:DROP|DELETE|UPDATE|INSERT)\\s|UNION\\s+SELECT|--\\s*$)", "flags": "i", "testMatch": "' OR 1=1 --", "testNoMatch": "normal search query", "language": "SQL", "useCase": "Web application firewall, input validation, security scanning", "difficulty": "Advanced", "description": "Detects common SQL injection attack patterns including OR-based, UNION, and command injection.", "related": [ "xss-pattern", "command-injection" ] }, { "slug": "docker-image", "name": "Docker Image Reference", "category": "DevOps", "pattern": "^(?:([a-z0-9]+(?:[._-][a-z0-9]+)*)\\/)?([a-z0-9]+(?:[._-][a-z0-9]+)*)(?::([a-zA-Z0-9][a-zA-Z0-9._-]{0,127}))?(?:@sha256:[a-fA-F0-9]{64})?$", "flags": "", "testMatch": "nginx:latest", "testNoMatch": "NGINX:Latest", "language": "Universal", "useCase": "Container deployment, CI/CD pipelines, registry management", "difficulty": "Advanced", "description": "Validates Docker image references including registry, repository, tag, and digest components.", "related": [ "semantic-version", "url" ] }, { "slug": "credit-card-mastercard", "name": "Mastercard Credit Card Number", "category": "Financial", "pattern": "^(?:5[1-5][0-9]{2}|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$", "flags": "", "testMatch": "5500000000000004", "testNoMatch": "4111111111111111", "language": "Universal", "useCase": "Payment validation, transaction processing", "difficulty": "Advanced", "description": "Validates Mastercard numbers starting with 51-55 or 2221-2720 in 16-digit format.", "related": [ "credit-card-visa", "credit-card-amex" ] }, { "slug": "kubernetes-resource-name", "name": "Kubernetes Resource Name", "category": "DevOps", "pattern": "^[a-z0-9]([a-z0-9-]{0,61}[a-z0-9])?$", "flags": "", "testMatch": "my-deployment-v2", "testNoMatch": "My_Deployment", "language": "Universal", "useCase": "K8s manifest validation, resource naming, CI/CD", "difficulty": "Beginner", "description": "Validates Kubernetes resource names: lowercase alphanumeric with hyphens, max 63 characters.", "related": [ "docker-image", "dns-hostname" ] }, { "slug": "credit-card-visa", "name": "Visa Credit Card Number", "category": "Financial", "pattern": "^4[0-9]{12}(?:[0-9]{3})?$", "flags": "", "testMatch": "4111111111111111", "testNoMatch": "5111111111111111", "language": "Universal", "useCase": "Payment validation, fraud detection", "difficulty": "Intermediate", "description": "Validates Visa card numbers starting with 4, supporting 13 or 16 digit formats.", "related": [ "credit-card-mastercard", "credit-card-amex" ] }, { "slug": "log-timestamp", "name": "Log File Timestamp", "category": "System Administration", "pattern": "^\\d{4}-\\d{2}-\\d{2}[T ]\\d{2}:\\d{2}:\\d{2}(?:\\.\\d{1,6})?(?:Z|[+-]\\d{2}:?\\d{2})?", "flags": "", "testMatch": "2024-03-15T14:30:00.123Z", "testNoMatch": "March 15, 2024", "language": "Universal", "useCase": "Log parsing, monitoring, time-series analysis", "difficulty": "Intermediate", "description": "Matches ISO 8601 timestamps commonly found in application and system log files.", "related": [ "iso-date", "time-24hour" ] }, { "slug": "sql-injection-detect", "name": "SQL Injection Pattern", "pattern": "(?:--|;|\\b(?:SELECT|INSERT|UPDATE|DELETE|DROP|UNION|ALTER)\\b)", "description": "Detect common SQL injection attempts" }, { "slug": "log-level", "name": "Log Level", "pattern": "\\b(DEBUG|INFO|WARN|ERROR|FATAL|TRACE)\\b", "description": "Match standard log level keywords" }, { "slug": "semver-version", "name": "Semantic Version", "pattern": "^(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?$", "description": "Match semantic versioning strings" }, { "slug": "terraform-resource", "name": "Terraform Resource Reference", "pattern": "\\b(?:aws|azurerm|google)_[a-z_]+\\.[a-z_]+", "description": "Match Terraform resource references" }, { "slug": "graphql-query", "name": "GraphQL Query", "pattern": "\\b(query|mutation|subscription)\\s+\\w+", "description": "Match GraphQL operation definitions" }, { "slug": "github-repo-url", "name": "GitHub Repository URL", "pattern": "https?://github\\.com/[A-Za-z0-9_.-]+/[A-Za-z0-9_.-]+", "description": "Match GitHub repository URLs" }, { "slug": "npm-package-name", "name": "NPM Package Name", "pattern": "^(@[a-z0-9-~][a-z0-9-._~]*/)?[a-z0-9-~][a-z0-9-._~]*$", "description": "Match valid npm package names" }, { "slug": "docker-image-tag", "name": "Docker Image Tag", "pattern": "^[a-z0-9]+(?:[._-][a-z0-9]+)*(?:/[a-z0-9]+(?:[._-][a-z0-9]+)*)*(?::[a-zA-Z0-9._-]+)?$", "description": "Match Docker image names with tags" }, { "slug": "env-variable", "name": "Environment Variable", "pattern": "^[A-Z_][A-Z0-9_]*=.*$", "description": "Match KEY=value environment variable format" } ] }