regex,time , RegEx matching HH:MM, HH:MM:SS OR HH:MM:SS.XXX


RegEx matching HH:MM, HH:MM:SS OR HH:MM:SS.XXX

Question:

Tag: regex,time

So far I have the following:

^(([0-1][0-9])|([2][0-3])):([0-5][0-9])(:([0-5][0-9]))?([.]\d{1,3})?$

This matches (as expected) 23:59, 23:59:30, 23:59:34.123 or 23:59:12.1 Doesn't match 23:60, 23:59. But unfortunately matches 23:59.60 Any ideas how to give the finishing touches?


Answer:

Since milliseconds are allowed only when seconds are present, you should make the optional parts for milliseconds nested inside the optional part for seconds:

^(([0-1][0-9])|([2][0-3])):([0-5][0-9])(:[0-5][0-9](?:[.]\d{1,3})?)?$

Demo.


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