protected function criteriaPattern($sourceGridName, Criteria $criteria, $column)
 {
     list($regex) = $criteria->getArguments();
     $sql = ($criteria->isCaseSensitive() ? 'BINARY ' : '') . $column . ($criteria->isNegated() ? ' NOT' : '') . ' REGEXP ' . $this->escape($regex, true);
     return $sql;
 }