CODEWITHSUNDEEP
c#regex
Pindo
Pindo

Reputation: 1625

regex checking time

I've got the following regex:

^(?:(?:([01]?\d|2[0-3]):)?([0-5]?\d):)?([0-5]?\d)$

This currently will accept 00:00:00 or 00:00 or 00 I don't want it do this. It can accept 00:01 or 00:00:01 but not all zeros.

What have I missed in the regex?

Upvotes: 1

Views: 158

Answers (2)

npinti
npinti

Reputation: 52185

I think it might be easier to have another regex which will match whatever it is you do not want.

Something like so: ^(00:?)+$ should match what you do not want. Simply use that check before you use your current regex. Doing everything in one regular expression can be messy to build and change.

Upvotes: 0

Sergiu Toarca
Sergiu Toarca

Reputation: 2749

You can use negative lookaheads to solve this:

^(?!^(\D|0)*$)(?:(?:([01]?\d|2[0-3]):)?([0-5]?\d):)?([0-5]?\d)$

The negative lookahead that matches nondigits and zeroes. Thus if you have only zeroes in your time, it will fail to match.

You can see what it does in more detail on www.debuggex.com.

Upvotes: 3

Related Questions