From: Shea Barton <shea@...>
Date: 2010-11-11T12:08:37+09:00
Subject: Re: Total string length regex

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

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