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Editorial Team
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Asked: 2026-05-22T18:55:21+00:00

I have a RegularExpressionValidator on my page which validates an email using this <asp:RegularExpressionValidator

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I have a RegularExpressionValidator on my page which validates an email using this

    <asp:RegularExpressionValidator ID="valEmailExpression" 
    runat="server" 
ErrorMessage="Your email address does not appear to be of a valid form. (eg: your.name@yourorganisation.com)"
    ControlToValidate="txtUsername" EnableClientScript="false" 
    ValidationExpression=**"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"**
    Display="None"></asp:RegularExpressionValidator>

This works for things like “hello@hello.com”

but if the user cut and pastes emails in, sometimes you get things like “hello@hello.com ” or ” hello@hello.com “.

Is it possible to specify in the regular expression that I would like to trim the white spaces before validating the email?

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1 Answer

  1. Editorial Team

    You could just add white-space checks to your regex:

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