[PHP] Core: RegEx

RegEx.php

<?php

class RegEx {
	protected $pattern;

	public function __construct($pattern){
		$this->pattern = $pattern;
	}
	
	public function test($subject, $flags = 0){
		if (($res = preg_match($this->pattern, $subject, $flags)) === false){
			throw new \Exception(static::lastError());
		} else return (bool) $res;
	}
	
	public static function lastError(){
		switch($last_error = preg_last_error()){
			case PREG_NO_ERROR: 			  return false;
			case PREG_INTERNAL_ERROR: 		  return 'There is an internal error!';
			case PREG_BACKTRACK_LIMIT_ERROR: return 'Backtrack limit was exhausted!';
			case PREG_RECURSION_LIMIT_ERROR: return 'Recursion limit was exhausted!';
			case PREG_BAD_UTF8_ERROR: 		  return 'Bad UTF8 error!';
			case PREG_BAD_UTF8_OFFSET_ERROR: return 'Bad UTF8 offset error!';
			case PREG_JIT_STACKLIMIT_ERROR:  return 'JIT stack limit was exhausted!';
			default: return array_flip(get_defined_constants(true)['pcre'])[$last_error];
		}
	}

}

class RegExMatches implements ArrayAccess {
	protected $pattern,
			  $matches;

	public function __construct($pattern, $matches){
		$this->pattern = $pattern;
		$this->matches = $matches;
	}
			
	public function offsetExists($offset){
		return isset($this->matches[$offset]);
	}

	public function offsetGet($offset){
		return $this->matches[$offset];
	}

	public function offsetSet($offset, $value){}
	public function offsetUnset($offset){}

}