MwUrlModule.php

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<?php
namespace MediaWiki\ResourceLoader;
 
class MwUrlModule {
    public static function makeJsFromExtendedRegExp( string $content ): string {
        // Remove whitespace.
        $content = preg_replace( '/\s+/', '', $content );
        // Remove named capturing groups.
        // This allows long regexes to be self-documenting, which we allow for
        // developer convenience, but this syntax is invalid JavaScript ES5.
        $content = preg_replace( '/\?<\w+?>/', '', $content );
        // Format as a valid JavaScript import.
        return 'module.exports = /' . strtr( $content, [ '/' => '\/' ] ) . '/;';
    }
}