Regular Expression for date format validation

Question

What is the regular expression for date format (mm-dd-yyyy) and validating them?

Kamran Ahmed · Accepted Answer · 2013-12-15T06:50:16.637

2

Here it is

((0[1-9])|(1[0-2]))-(([0-2]\d)|([3][01]))-(\d{4})

Explanation:

Since mm can be any thing from 01 to 12 so to suffice 01-09, regular expression would be 0[1-9] or as mm can also be 10-12 so 1[0-2].

Hence the regular expression to match mm would be (0\d)|(1[0-2])
As dd can be any thing from 01 to 31 so to suffice 01-29 regular expression would be [0-2]\d or it can also be 30-31 so [3][01].

Hence the regular expression to match dd would be (([0-2]\d)|([3][01]))
As yyyy can be any number of 4 digits i.e. 2010, 1999, 2050 etc (as long as you are not considering any specificrange) so the regular expression would simply be 4 digits i.e. \d{4}.

Hence the regular expression to match yyyy would be (\d{4})

So after combining these, the complete regular expression for the date would be:

((0[1-9])|(1[0-2]))-(([0-2]\d)|([3][01]))-(\d{4})

edited Dec 15 '13 at 06:50

answered Dec 15 '13 at 06:33

Kamran Ahmed

Thank You friends this is very use full for me – Dinesh Dinaz Dec 15 '13 at 06:35
Your "Here it is" regular expression at the top does not match your expression at the bottom : your day should be `[0-2]\d` – Mr. Polywhirl Dec 15 '13 at 06:45
@Mr.Polywhirl actually I edited the question later and forgot to update that. Updated now. Thanks – Kamran Ahmed Dec 15 '13 at 06:50

1 Answers1