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asp.net control validation email

I use the following asp net email validator and it works fine until today I get an email (jsmiths@ca--homes.com).
And I want to ensure to accept this string '--'.

how can I do that with my current email validator?

<asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server"
            ControlToValidate="NewEmailAddressTextBox" CssClass="red bold"
            Display="Dynamic" ErrorMessage="*"

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Last Comment

8/22/2022 - Mon
David Favor

Better to do this...

1) Split out user + host parts.

2) Run many regexp patterns against each separately.

Tip: Trying to create a validator with a single regular expression is near impossible to debug or extend.

I guess how to create ValidationExpression to accept -- and @ will be helpful.

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