How to Validate Email Address using RegularExpression validator?

Question

I have used the below code to validate the email address:

<asp:RegularExpressionValidator ID="EmailAddressFormatValidator" runat="server" 
     ControlToValidate="EmailAddressTextBox" 
     ErrorMessage="RegularExpressionValidator" 
     Display="Dynamic" 
     ValidationExpression="\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" 
     EnableClientScript="False">Email Address is not valid.<br />       
</asp:RegularExpressionValidator>

It is working fine, but when users enters " " (space) in the end of the email, it stops working and declare the valid email to invalid, please help me how i can resolve this.

Answer 1

add \\s* towards the end of the regex you have

like this

\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*\s*

i have set up a demo here

http://regex101.com/r/tX7mA8

the regex I have used here is ^\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*\\s*$

I have not much about your language so I suppose those anchor tags are present there for you by default

Answer 2

Just use this:

ValidationExpression="\\s*\\w+([-+.']\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*\\s*" in place of your Validation Expression.

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