Change Password Control RegEx validating oddly in IE 7 only

Question

I\'m using the Asp.net change password control in my application and all seems to be find and dandy until a user tells me she has a problem meeting the strength requirements

Answer 1

Apparently Internet Explorer has a bug. Check out this post: A JScript/VBScript Regex Lookahead Bug. The example is the same - a password check - and they provide a work-around. Using their suggested approach as a guide, the pattern becomes:

^(?=.{5,15}$)(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?!.*\s).*

Their pattern is very similar to yours, except for the negative look-around for whitespace.

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Try using .* in the look-arounds. Using just . only covers one character followed by whatever you're specifying in the look-arounds. You want to look all the way ahead and see if anything matches. I tried the following expression in Expresso and it worked with the samples you listed and also failed on invalid inputs as expected.

^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?!.*\s).{5,15}$