Recently we had built a web application using ASP.NET MVC 3, and had used Regular Expression for checking of password strength.
The above expression checks for password length to be minimum 8 characters and one special character.
It was working fine in IE 8 and IE 9. However we had our users using IE 7 as well, in which it was not working properly. As we were having our machine running Windows 7 and Windows Server 2008, it was not possible to have IE 7 installed in it. However recently going through one of the blog I have subscribed to I came to know about a tool which we can use to test our application in IE 7.
IE Tester tool:-
The helpful post:-
Hope it helps.