>No. Both should work the same. BTW, it's a bit tricky problem here if we want to allow all characters to be present in the string, e.g. \[ ] _
>it may be hard to find a way to escape special character.

Well, the most important one that seems to come once in a while is _. So, for that one, I can use the [_] syntax. As for the other three, I guess I should forbid the use of them. lol