Email validation problem REGEX on IE7

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Hi, I have an IE7 spesific REGEX problem.
I'm validating Email Address with the following regex:

^\s*[a-zA-Z0-9_\+-]{1,63}(\.[a-zA-Z0-9_\+-]{1,63})*@(?=[a-zA-Z0-9-\.]{0,255}\.?\s*$)[a-zA-Z0-9-]{1,63}(\.[a-zA-Z0-9-]{1,63}){0,126}\.([a-zA-Z]{2,63})\.?\s*$

This works every modern browser but IE7 (which support customer wants to extend to the page) does not work with f.e fistname.surname@domainname.com

I read about lookahead like "?=" being problem in IE7 but suggested changes do not seem to work? Does any regex guru has any ideas how to get this work with IE 7 and still keep it functional in more modern browser versions.

Posted 22-Sep-11 23:49pm

Tommi Kemppi

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OriginalGriff 23-Sep-11 6:24am

Do you mean that this regex fails in Javascript on IE7 only, but works on FF, Chrome,...?

3 solutions

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DaveAuld · Answer 1 · 2011-09-23T02:33:00

Solution 1

How about visiting www.regexlib.com[^] and looking at some of the other email validation expressions

There are 38 listed under 'Email' tag.

Posted 23-Sep-11 2:33am

DaveAuld

uspatel · Answer 2 · 2011-09-23T02:38:00

try this

C#

public static bool emailid(string em)
       {
           const string MatchEmailPattern =
             @"^(([\w-]+\.)+[\w-]+|([a-zA-Z]{1}|[\w-]{2,}))@"
      + @"((([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?
               [0-9]{1,2}|25[0-5]|2[0-4][0-9])\."
      + @"([0-1]?[0-9]{1,2}|25[0-5]|2[0-4][0-9])\.([0-1]?
               [0-9]{1,2}|25[0-5]|2[0-4][0-9])){1}|"
      + @"([a-zA-Z]+[\w-]+\.)+[a-zA-Z]{2,4})$";



           if (!Regex.IsMatch(em, MatchEmailPattern))
               return true;
           else
               return false;

       }

Tommi Kemppi · Answer 3 · 2011-09-24T00:32:00

Solution 3

Solution 2 seemed to work older IE:s

This was maybe the problem with previous regex:

}@(?=[a-zA-Z0-9-\.]{0,255}\.?\s*$)[

Posted 24-Sep-11 0:32am

Tommi Kemppi