[Black Snow]

Originally Posted by 3lou 55

Yep cheers, that worked!
Thanks alot.

I found that some people use seperators more than once in a row so I had to make sure that the first and last character are not separators, and that there's never more than one separator in a row. Here's my way:

/^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/

After matching one or more alphanumeric characters, if there's a separator it must be followed by one or more alphanumerics.