'rule' => '/^(?!\\s)[a-zA-Z0-9\\x2d-\\x2f\\x7f-\\xff_-\\s]+(?!\\s)$/',
'rule' => '/^(?!\\s)[a-zA-Z0-9\\x2d-\\x2f\\x7f-\\xff-_\\s]+(?!\\s)$/',
Hey Alejandro,
Somehow my solution did not get posted. I was upgrading my local server and with that also the php version upgraded to version 5.5.10. After downgrading to php version 5.4.x everything was working again fine. So it seems to be an issue with PHP version.