Issue with regex compatibility in Internet Explorer 7 - Regex pattern functioning correctly across all browsers except IE7

My password validation regex ensures that the password is between 6 and 25 characters long, and contains at least one number.

var passwordRegEx = /^(?=.*\d)(?=.*[a-zA-Z]).{6,25}$/;
if(!#quickRegister_Password').val().test(pass))
{
   errorMgs += 'Your password must be at least 6 characters and have at least 1 number and 1 letter.\r\n';
}

This code works perfectly in Firefox, Chrome, IE8 (IE7 ran from compatibility in IE8) but encounters issues in standalone IE7.

Answer №1

It seems like you've encountered the regular expression lookahead bug in IE7's javascript engine.

To confirm this issue, you can run some tests on this page and compare your results; chances are the lookahead tests will not pass:

Here is some additional information regarding this bug:

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