Hello,

 

I need help...I'm trying to have a regex expression that validates a strong password with 8-12 chars, 1 uppercase, 1 lowercase and 1 digit, but this regex when applied to a asp:regularfieldvalidator it works on Firefox and not on IE6/7, because of the lookaheads. Can you, please pretty please, help me?

 The regex is

 (?=.*[a-z].*)(?=.*[A-Z].*)(?=.*\d.*)\S{8,12}

Thank you,

http://regexadvice.com/forums/thread/51012.aspx

 

The bug http://regexadvice.com/blogs/mash/archive/2004/10/05/320.aspx

The bug revisited http://regexadvice.com/blogs/mash/archive/2009/02/21/Looking-again-at-the-Lookahead-bug.aspx

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Michael

"In theory, theory and practice are the same. In practice, they are not."
Albert Einstein

javiercubre:

Hello,

 

I need help...I'm trying to have a regex expression that validates a strong password with 8-12 chars, 1 uppercase, 1 lowercase and 1 digit, but this regex when applied to a asp:regularfieldvalidator it works on Firefox and not on IE6/7, because of the lookaheads. Can you, please pretty please, help me?

 The regex is

 (?=.*[a-z].*)(?=.*[A-Z].*)(?=.*\d.*)\S{8,12}

Thank you,

 

As mash noted in the referenced thread, you could reorder your lookaheads to work around the issue:

^(?=\S{8,12}$)(?=.*[a-z])(?=.*[A-Z])(?=.*\d)

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