From: Ammar Ali <ammarabuali@...>
Date: 2010-11-11T16:20:18+09:00
Subject: Re: Total string length regex

On Thu, Nov 11, 2010 at 5:08 AM, Shea Barton <shea@sysach.com> wrote:
> I've actually been using rubular - but unfortunately it isn't quite as
> helpful for more advanced regexes involving lookaheads / behinds etc.
>
> Although I found a proper regex that worked using Joel's example, a
> better solution to the problem was just to use my existing regex with
> validates_format_of, in conjunction with validates_size_of

It's worth noting that \w and \W do not handle utf-8 properly in all
cases, even with the u option. If you plan to allow/support i18n'ed
usernames, consider using Unicode character properties in you regular
expressions. For more information take a look at:

  http://ruby.runpaint.org/regexps#properties

These properties are only available in ruby 1.9 though.

Regards,
Ammar