PHPUnit_Framework_Assert::assertNotRegExp PHP Method

    public static function assertNotRegExp($pattern, $string, $message = '')
    {
        if (!is_string($pattern)) {
            throw PHPUnit_Util_InvalidArgumentHelper::factory(1, 'string');
        }
        if (!is_string($string)) {
            throw PHPUnit_Util_InvalidArgumentHelper::factory(2, 'string');
        }
        $constraint = new PHPUnit_Framework_Constraint_Not(new PHPUnit_Framework_Constraint_PCREMatch($pattern));
        static::assertThat($string, $constraint, $message);
    }

 /**
  * @Given No entry was set
  */
 public function noEntryExists()
 {
     $sitemap = $this->app['sitemap']->generate(false);
     PHPUnit_Framework_Assert::assertNotRegExp('/\\<url\\>/', $sitemap);
 }