Thanks OriginalGriff,I have changed the format to ^[_a-zA-Z0-9-]+(\.[_a-zA-Z0-9-]+)*@[a-zA-Z0-9-]+(\.[a-zA-Z0-9-]+[.])*(\.[a-zA-Z]{2,4})$.But i cant able to test the below mentioned format as valid.COuld you please modify the regEx.
Formats:
Valid: js#internal@proseware.com
Valid: j_9@[129.126.118.1]
Regards,
Hsakarp