User1535942433 posted
Hi georgeakpan233,
Accroding to your codes,as far as I think,the validationExpression in RegularExpressionValidator control is different with in jquery.
You could replace:
ValidationExpression="/^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;"
With:
ValidationExpression="^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$;"
Best regards,
Yijing Sun