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Javascript regex for integer only, not to start with 0 but allow 0 - Stack Overflow

I need a regex to validate integer numbers. 05 and 00 are not allowed but 0 is allowed. Currently I have this:

/^[1-9]\d*$/

But it does not allow 0. Thanks for help.

I need a regex to validate integer numbers. 05 and 00 are not allowed but 0 is allowed. Currently I have this:

/^[1-9]\d*$/

But it does not allow 0. Thanks for help.

Share Improve this question asked Aug 18, 2012 at 12:17 Rafael Sedrakyan 2,62910 gold badges36 silver badges42 bronze badges

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2 Answers 2

Sorted by: Reset to default 12

 ^(?:[1-9]\d*|0)$

This is your pattern...

Your regex should be ^(?!0.)\d+$