Hexadecimal Number Regex Pattern
Validates hexadecimal numbers with optional 0x prefix. Used in color codes, memory addresses, and low-level programming.
Live Regex Tester
Pattern Breakdown
Code Examples
JavaScript
const regex = /^(0x)?[0-9a-fA-F]+$/; const test = "0xFF00FF"; console.log(regex.test(test)); // true // Extract matches const matches = test.match(regex); console.log(matches);
Python
import re pattern = r'^(0x)?[0-9a-fA-F]+$' test = "0xFF00FF" match = re.search(pattern, test) print(match) # Found!
Go
package main
import (
"fmt"
"regexp"
)
func main() {
re := regexp.MustCompile(`^(0x)?[0-9a-fA-F]+$`)
fmt.Println(re.MatchString("0xFF00FF")) // true
}Common Use Cases
Match Examples
| Input | Result |
|---|---|
| 0xFF00FF | Match |
| 0xGG | No Match |
About the Hexadecimal Number Regex
Validates hexadecimal numbers with optional 0x prefix. Used in color codes, memory addresses, and low-level programming.
Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The hexadecimal number pattern is classified as beginner difficulty in the numbers category. It works in all major programming languages.
When using this regex, always consider edge cases and test thoroughly with real-world data. Use the interactive tester above to validate the pattern against your specific inputs before deploying to production.
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Frequently Asked Questions
What is the Hexadecimal Number regex pattern?
Validates hexadecimal numbers with optional 0x prefix. Used in color codes, memory addresses, and low-level programming.
How do I use the Hexadecimal Number regex?
Use the pattern /^(0x)?[0-9a-fA-F]+$/ in your code. In JavaScript: new RegExp('^(0x)?[0-9a-fA-F]+$', ''). Test it above with your own input.
What does this Hexadecimal Number regex match?
This pattern matches: "0xFF00FF". It does NOT match: "0xGG". Color codes, memory addresses, binary data representation.
Is the Hexadecimal Number regex beginner-friendly?
This pattern is rated Beginner. It uses basic regex syntax and is easy to understand.
What languages support the Hexadecimal Number regex?
This pattern works in all major programming languages including JavaScript, Python, Java, C#, Go, Ruby, PHP, and more. Syntax may vary slightly between regex engines.
Can I modify the Hexadecimal Number regex for my use case?
Yes! Use the interactive tester above to modify the pattern and test with your own data. Common modifications include making it case-insensitive (add 'i' flag), matching globally (add 'g' flag), or adjusting character classes.