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<?php
namespace Vanderlee\Comprehend\Parser\Terminal;
use Vanderlee\Comprehend\Core\Context;
use Vanderlee\Comprehend\Parser\Parser;
/**
* Matches regular expressions
*
* @author Martijn
*/
class Regex extends Parser
{
use CaseSensitiveTrait;
* @var string|null
private $pattern = null;
public function __construct($pattern)
if (empty($pattern)) {
throw new \InvalidArgumentException('Empty pattern');
}
if (@preg_match($pattern, null) === false) {
throw new \InvalidArgumentException('Invalid pattern');
$this->pattern = $pattern;
protected function parse(&$input, $offset, Context $context)
$this->pushCaseSensitivityToContext($context);
$pattern = $this->pattern . ($context->isCaseSensitive() ? '' : 'i');
$this->popCaseSensitivityFromContext($context);
if (preg_match($pattern, $input, $match, 0, $offset) !== false) {
if (count($match) > 0 && mb_strlen($match[0]) > 0 && strpos($input, $match[0], $offset) == $offset) {
return $this->success($input, $offset, mb_strlen($match[0]));
return $this->failure($input, $offset);
public function __toString()
return (string)$this->pattern;
vanderlee /
Comprehend
