Regular expression to validate time but exclude 0:00

Question

I'm not an expert to regular expressions, but I tried to validate the user input for a time field with it.

My current regex: /^([0-9]|0[0-9]):[0-5][0-9]$/

It should validate anything positive between 0:01 and 9:59, but it also give positive return to 0:00.

Can you please help me to modify my regular expression to exclude 0:00?

Thanks a lot!

Answer 1

Here is the regex you are looking for.

^((?!(0:00)|(00:00)$)0?[0-9]:[0-5][0-9])$

Uses the concept of negative look ahead. Using negative lookahead, you can say match everything except 0:00 and 00:00.

---

Hope this helps!

Answer 2

You could use a negative lookahead:

^(?!0?0:00$)0?[0-9]:[0-5][0-9]$