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Asked: 2026-05-11T06:47:34+00:00

I need to validate an input on a form. I’m expecting the input to

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I need to validate an input on a form. I’m expecting the input to be a number between 1 to 19 digits. The input can also start with zeros. However, I want to validate that they are not all zeros. I’ve got a regex that will ensure that the input is numeric and between 1 and 19 numbers.

^\d[1,19]$

But I can’t figure out how to include a check that the entire string is not all zeros. I tried this

^(![0]{1,19})(\d[1,19])$

but it fails on 0000000000000000001 because it’s allowing a variable number of zeros.

How do I check that the entire string is NOT zeros?

Thanks.

I’m trying to do this in a ASP.NET RegularExpressionValidator so I was hoping for a single expression. I have other options, so I’m not out of luck if this can’t be done.

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1 Answer

  1. ^(?!0+$)\d{1,19}$

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