Web Forms :: Looking For Regex That Validates 4-digits And Empty Value?

Jun 18, 2010

I can validate textbox field by RegularExpressionValidator with regex "^([0-9]{3,3})$". For the required field validation I put requiredfieldvalidator. Thus, I have two validation controls.

Can I combine them into a sigle RegularExpressionValidator? Then what does regex look like? How can I validate empty fields with RegularExpressionValidator?

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