Comments on: A JScript/VBScript Regex Lookahead Bug

By: RegEx problem with IE7 when trying validate Email address

RegEx problem with IE7 when trying validate Email address — Fri, 07 Oct 2011 12:28:43 +0000

[...] Now this works allright with IE8 –> and latest Mozilla and Opera version for example. I already read about this article: http://blog.stevenlevithan.com/archives/regex-lookahead-bug [...]

Praveen — Fri, 08 Apr 2011 04:44:43 +0000

I need a help regarding regular expression for strong password. conditions are

Password must contain at least 8 characters including at least 2 numbers

Must Allowed :
1abcdef2
21abcdef
abcdef22
1abcd4ef
1a$bcdef
1abcd^f2
12345678
1234567d
1234567%
1234567%33434
1234567%ddd
1234567dd%

Not Allowed
abcdef5%

it has to work in IE 7 ,IE8

i have a regulare Expression (ValidationExpression=”(?=(?:.*?\d){2})(?=(?:.*?[A-Za-z@#$%^&+=]){2}).{8,}” )
but it is not working in IE7

B. David Holt — Thu, 30 Sep 2010 11:54:27 +0000

It looks like the capturing is the problem. My solution:

follow every lookahead (except the last one, if it is the ending of the regex) with:
.*?

If your regex ends with a lookahead, follow it with
.*

IE7 appears to want to end the validation with a capture.

Jesse — Tue, 21 Sep 2010 22:10:36 +0000

Did anyone actually file a bug at Microsoft Connect for this? And does this still exist after all the years of servicepacks and updates?

A JScript/VBScript Regex Lookahead Bug « DotNet Strings — Mon, 06 Sep 2010 09:36:29 +0000

[...] to a blog post by Steve that describes the bug with a password-complexity regex. However, the bug description there is [...]