Question

I have a date entry control on a UI. It auto-completes the date as numbers are typed.

Currently using:

\d{1,2}(\.|\/|-)\d{1,2}

Test on http://regexpal.com/ to see it working.

Basically 1 or 2 digits, followed by one of ./-, and 1 or 2 digits. e.g. 01/9, 1/2, 1/1, will match

What I’m looking to do (and can’t!):

If the second set of digits (the Month part) is 0 or 1, need another digit

If the second set of digits is 2-9, match

That’s it basically, thanks

Brian

Answer 1

Number ranges are a bit annoying in regex, and should maybe be done in a separate step, when the format is validated. But here is the regex:

\d{1,2}[/.-](0?[2-9]|1[0-2]|01|1[/.-])

That should match all the requirements (including the ones from the comments). Possible months:

2, 3, ..., 9
01, 02, 03, ..., 09
10, 11, 12
1/, 1., 1-