Introduction to regexpu

The regexpu library allows developers to work with JavaScript regular expressions in an enhanced way, making it easier to work with Unicode properties and other advanced regex features. In this guide, we’ll explore various useful APIs of regexpu and provide code snippets to help you get started.

Installation

  npm install regexpu

API Examples

Transform Regular Expression

Transforms ES6 regular expression syntax to ES5.

  
    const { rewritePattern } = require('regexpu');
    const regex = rewritePattern('a(.)\\1', 'u');
    console.log(regex); // Output: /a(.)\1/
  

Using Unicode Flag

Enable the use of Unicode properties in regular expressions.

  
    const { rewritePattern } = require('regexpu');
    const regex = rewritePattern('\\p{Script=Greek}', 'u');
    console.log(regex); // Output: /(?:\\u03A3|\\u03B1|\\u03B2|...|\\u03F4)/
  

Emoji Matching

Match emoji characters using Unicode properties.

  
    const { rewritePattern } = require('regexpu');
    const regex = rewritePattern('\\p{Emoji}', 'u');
    const str = '😀😃😄😁';
    console.log(str.match(new RegExp(regex, 'g'))); // Output: ['😀', '😃', '😄', '😁']
  

App Example

Here is an example application that uses regexpu to validate Unicode characters and emojis in a string.

  
    // Install regexpu if not already installed
    // npm install --save regexpu

    const { rewritePattern } = require('regexpu');

    // Function to validate and transform regex
    function validateUnicodeRegex(pattern) {
      return new RegExp(rewritePattern(pattern, 'u'), 'u');
    }

    const greekRegex = validateUnicodeRegex('\\p{Script=Greek}');
    const emojiRegex = validateUnicodeRegex('\\p{Emoji}');

    const testString = 'This is a test string with Greek α and emoji 😀 in it.';

    console.log(greekRegex.test(testString)); // Output: true
    console.log(emojiRegex.test(testString)); // Output: true
  

This simple application showcases how to transform and validate strings containing complex Unicode characters and emojis using the regexpu library.

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