src/Formatters/MetaFormatter.php
protected function metaKeyIsRegex($meta)
    {
        if (!isset($meta['meta_key'])) {
            return false;
        }

        return $this->pregMatchArray($meta['meta_key'], $this->regex);
    }
protected function metaKeyIsRegex($meta)
    {
        if (!isset($meta['meta_key'])) {
            return false;
        }

        return $this->pregMatchArray($meta['meta_key'], $this->regex);
    }
protected function metaKeyIsRegex ( $ meta ) { if ( ! isset ( $ meta [ 'meta_key' ] ) ) { return false ; } return $ this -> pregMatchArray ( $ meta [ 'meta_key' ] , $ this -> regex ) ; }
Meta key is regex?

@param array $meta

@return array|bool
Meta key is regex?