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Asked: 2026-06-10T11:05:41+00:00

I’m working with a simple RegularExpressionValidator . The textbox has to be 14 digits

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I’m working with a simple RegularExpressionValidator. The textbox has to be 14 digits long (exactly 14). So, I use ValidationExpression="\d{14}"></asp:RegularExpressionValidator> but that instance just allow numbers, and I need letters also (to be clear, no special characters or dots, semi-colons, only numbers and letters).

What would fit better than "\d{14}" ?

thanks!

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1 Answer

  1. Editorial Team

    \d replaces only digit characters.
    Try with \w which replaces letters and also numbers.

    So your expression should be:

    <asp ValidationExpression="\w{14}"></asp:RegularExpressionValidator>
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