Ben V. wrote:
> I am trying to validate user input so it contains only letters, numbers, 
> underscores and dashes. I am using this regexp:/[A-Z0-9_-]/. However, 
> when I type in 'hello' in the field, it says that it doesn't match the 
> regexp, yet I'm sure that reg exp works for letters, numbers, and 
> underscores only. What am I doing wrong? Thanks for your help and time.
>
>   
Shouldn't your regexp accept lowercase as well? /[A-Za-z0-9_-]/?

Or you could simplify things a bit and use \w, which matches word 
characters, and \d, which matches digits?

[\w\d_-]