Regex to validate date format dd/mm/yyyy

Question

I need to validate a date string for the format dd/mm/yyyy with a regular expresssion.

This regex validates dd/mm/yyyy, but not the invalid

Answer 1

Here is another version of regex to match any of the following date formats and allow leading zeros to be omitted:

Regex: ^[0-3]?[0-9].[0-3]?[0-9].(?:[0-9]{2})?[0-9]{2}$

Matches:

1/1/11 or 1.1.11 or 1-1-11 : true 01/01/11 or 01.01.11 or 01-01-11 : true 01/01/2011 or 01.01.2011 or 01-01-2011 : true 01/1/2011 or 01.1.2011 or 01-1-2011 : true 1/11/2011 or 1.11.2011 or 1-11-2011 : true 1/11/11 or 1.11.11 or 1-11-11 : true 11/1/11 or 11.1.11 or 11-1-11 : true

Debuggex Demo