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<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Framework\Constraint;

use function preg_match;
use function sprintf;

/**
 * Constraint that asserts that the string it is evaluated for matches
 * a regular expression.
 *
 * Checks a given value using the Perl Compatible Regular Expression extension
 * in PHP. The pattern is matched by executing preg_match().
 *
 * The pattern string passed in the constructor.
 */
class RegularExpression extends Constraint
{
    /**
     * @var string
     */
    private $pattern;

public function __construct(string $pattern)
    {
        $this->pattern = $pattern;
    }

/**
     * Returns a string representation of the constraint.
     */
    public function toString(): string
    {
        return sprintf(
            'matches PCRE pattern "%s"',
            $this->pattern
        );
    }

/**
     * Evaluates the constraint for parameter $other. Returns true if the
     * constraint is met, false otherwise.
     *
     * @param mixed $other value or object to evaluate
     */
    protected function matches($other): bool
    {
        return preg_match($this->pattern, $other) > 0;
    }
}