<?php #BLM final class ABNFParser { private const ABNF_REGEX = <<<'REGEX' (?(DEFINE) (?<ALPHA>[A-Za-z]) (?<DIGIT>[0-9]) (?<SP>[\x20]) (?<WSP>[(?&SP)\x09]) (?<CR>\x0D) (?<LF>\x0A) (?<Repeat>(?:(?:(?&DIGIT)+(?:(?&DIGIT)*[\x2A](?&DIGIT)*)))) ) REGEX; public function parse(string $input, string $rule): ?string { // Build the query pattern dynamically based on the provided rule $pattern = sprintf('#%s(?&%s)#Aux', self::ABNF_REGEX, $rule); if (preg_match($pattern, $input, $matches)) { return $matches[0]; } return null; } } # Example Usage $parser = new ABNFParser(); $input = '2*4'; $rule = 'Repeat'; $parsedResult = $parser->parse($input, $rule); var_dump($parsedResult); // Outputs: string(3) "2*4"
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