RegExp for json form rules fails #87

Regular expression for creating optimized JSON form rules (for data-rules attr) fails when there are escaped unicode character sequences (it should take into account only escaped quote character).

// this one fails (FormControl.php; line 387):
$rules = preg_replace('#"([^\\\\"\']*)"#i', "'$1'", $rules);

Is there any reason to replace double quotes for single quotes, anyway??