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<?php
namespace Vanderlee\Comprehend\Parser\Terminal;
use InvalidArgumentException;
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(string $pattern)
if (empty($pattern)) {
throw new InvalidArgumentException('Empty pattern');
}
if (@preg_match($pattern, null) === false) {
null
string
$subject
preg_match()
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation
ignore-type
if (@preg_match($pattern, /** @scrutinizer ignore-type */ 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
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