From: Tim Bray <tbray@...>
Date: 2006-09-02T13:58:25+09:00
Subject: Re: RegExp issues....

On Sep 1, 2006, at 6:57 PM, 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_-]/

There are many more letters than [A-Za-z].  You should either be  
explicit that you're testing only the ASCII subset, or be prepared to  
fail the first time someone includes the word 'caf�'.  And are you OK  
with '�' as well as '-'? -Tim