RegularExpressionValidator always fails, but ValidationExpression works in testing

Posted by Jerph on Stack Overflow See other posts from Stack Overflow or by Jerph
Published on 2010-05-21T21:36:19Z Indexed on 2010/05/21 21:40 UTC
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ASP.NET

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regex

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validation

I found the answer to this, but it's a bit of a gotcha so I wanted to share it here.

I have a regular expression that validates passwords. They should be 7 to 60 characters with at least one numeric and one alpha character. Pretty standard. I used positive lookaheads (the (?= operator) to implement it:

(?=^.{7,60}$)(?=.*[0-9].*)(?=.*[a-zA-Z].*)

I checked this expression in my unit tests using Regex.IsMatch(), and it worked fine. However, when I use it in a RegularExpressionValidator, it always fails. Why?

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