On Apr 15, 2011, at 6:30 AM, Michael Crawford <[email protected]> wrote:

> I'm trying to validate email addresses in Core Data but the regular 
> expression I'm using doesn't seem to work even though it looks correct.  I'm 
> using the following expression:
> 
> ^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$
> 

You cannot validate emails using a regular expression. They cannot describe all 
valid email addresses.

Even as a basic sanity check, your regexp is incorrect. It fails to allow for 
plus signs, for example, thus prohibiting use of Gmail's plus-addressing 
feature, which sends all mail addressed to [email protected] to 
[email protected].

--Kyle Sluder_______________________________________________

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