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Editorial Team
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Asked: 2026-05-20T04:51:33+00:00

I want to validate that a text box contains only numbers between 0 and

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I want to validate that a text box contains only numbers between 0 and 10.

This is the regex I am currently using:

@"^([0-9]|10)"

But it only matches 0-9. What should I change to make it match 10??

Thanks!

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1 Answer

  1. Editorial Team

    The 1 from 10 is matched by [0-9] because the regex engine matches from left to right. And since you only anchored the beginning-of-input : ^, the engine is satisfied if the 1 is matched.

    There are two solutions.

    1 – Swap it:

    @"^(10|[0-9])"

    or

    2 – anchor it with $:

    @"^([0-9]|10)$"
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