[RESOLVED] [Regex]Compilation failed: range out of order

[whisher06]

Hi.
I'd like to know why this
doesn't work:

function isValidString($str){
	return (bool)preg_match('#^[A-Za-z0-9_-\?]{5,15}$#D',$str);
}

this works:

function isValidString($str){
	return (bool)preg_match('#^[\w-_\?\.\*]{5,15}$#D',$str);
}

It's quite the same, isn't it ?

Bye.

[NogDog]

The "-\?" indicates a range of characters from "" to "?". However, "" has a higher ASCII code that "?", so it is an invalid range. If your intention was to specify the 3 separate characters "", "-", and "?", then you would need to escape the hyphen just as you did the question mark with a backslash: "-".

Also, note that the special escape character "\w" includes the underscore character (along with letters and numbers), so you can just use "\w" instead of "\w_".

[whisher06]

Thanks a lot for the full reply.

Bye.