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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.
699
With regex you have a couple of options to match a digit. You can use a number from 0 to 9 to match a single choice. Or you can match a range of digits with a character group e.g. [4-9]. If the character group allows any digit (i.e. [0-9]), it can be replaced with a shorthand (\d).
Definition and Usage The \f metacharacter matches form feed characters.
Basically (0+1)* mathes any sequence of ones and zeroes. So, in your example (0+1)*1(0+1)* should match any sequence that has 1. It would not match 000 , but it would match 010 , 1 , 111 etc. (0+1) means 0 OR 1. 1* means any number of ones.
^(?!0+$)\d{1,19}$
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