How to reject String "0" zero in Java with regex

chronos14 :

I have problem creating regex pattern to reject "0" value in String. I have tried to negate the string as follows

[^!(?0)]

but i believe this is wrong. Because it will also reject the String that contain zero, such as 10000". Is it possible to handle this with regex only? Because using if-else is easier though.

example:

• "0" - invalid
• "0000" - invalid
• "10" - valid
• "10000" - valid

Mena :

You can use:

^0+$

... and validate against it.

Essentially, it checks the input from start to end to make sure it's only made of 0s. You only need to invert the validation.

Or better:

!myString.matches("0+")

String#matches matches the whole string against a pattern. Negating the result of the invocation ensures only 0+ occurrences filling the whole string are invalid.

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