Regular Expression date issue

Question

I have multiple strings I want to loop through and check if any match the below format (unix timestamp, space, d/m/Y)

1513592758 18/12/2017

I have been using https://regexr.com/ to test and the closest I have gotten is using the below

([0-9]) (0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)\d\d

but this still does not give me an exact match.

Any help would be much appreciated!

Programming languages usually support date string to date object conversion, why not leverage that? What programming language are you using here? — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Aug 31, 2018 at 10:51
Probably a dupe of RegEx - Match Numbers of Variable Length Ask Question — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Aug 31, 2018 at 11:17

MrTux · Accepted Answer · 2018-08-31 10:52:06Z

You are soo close

([0-9]+) (0[1-9]|[12][0-9]|3[01])[ /.-](0[1-9]|1[012])[ /.-](19|20)\d\d

The plus means: one or more of the preceding character (class)

1 Answer 1