BytePane

Sentence Regex Pattern

Matches sentences starting with a capital letter and ending with period, exclamation, or question mark.

T
Text & Strings
Beginner
Difficulty
Universal
Language
g
Flags
// Regular Expression
/[A-Z][^.!?]*[.!?]/g

Live Regex Tester

Pattern Breakdown

[A-Z][^.!?]*[.!?]
Character class [ ]
Group ( )
Quantifier { }
Anchor ^ $
Repetition * + ?
Escape \
Alternation |
Any char .

Code Examples

JavaScript

const regex = /[A-Z][^.!?]*[.!?]/g;
const test = "This is a sentence.";
console.log(regex.test(test)); // true

// Extract matches
const matches = test.match(regex);
console.log(matches);

Python

import re

pattern = r'[A-Z][^.!?]*[.!?]'
test = "This is a sentence."
match = re.findall(pattern, test)
print(match)  # Found!

Go

package main

import (
    "fmt"
    "regexp"
)

func main() {
    re := regexp.MustCompile(`[A-Z][^.!?]*[.!?]`)
    fmt.Println(re.MatchString("This is a sentence.")) // true
}

Common Use Cases

NLP preprocessingtext splittingcontent analysis

Match Examples

InputResult
This is a sentence.Match
not a sentenceNo Match

About the Sentence Regex

Matches sentences starting with a capital letter and ending with period, exclamation, or question mark.

Regular expressions (regex) are powerful pattern matching tools used across virtually all programming languages. The sentence pattern is classified as beginner difficulty in the text & strings 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 Sentence regex pattern?

Matches sentences starting with a capital letter and ending with period, exclamation, or question mark.

How do I use the Sentence regex?

Use the pattern /[A-Z][^.!?]*[.!?]/g in your code. In JavaScript: new RegExp('[A-Z][^.!?]*[.!?]', 'g'). Test it above with your own input.

What does this Sentence regex match?

This pattern matches: "This is a sentence.". It does NOT match: "not a sentence". NLP preprocessing, text splitting, content analysis.

Is the Sentence regex beginner-friendly?

This pattern is rated Beginner. It uses basic regex syntax and is easy to understand.

What languages support the Sentence 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 Sentence 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.

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