What is the regular expression for validating a month with the leading zero?
Passes regular expression:
01,02,03,04,05,06,07,08,09,10,11,12
Fails regular expression:
1, 00, 13 and up.
views:
53answers:
2Getting rid of the parentheses can improve the performance of this expression.
Daniel Trebbien
2010-05-20 22:06:52
Expressed more succinctly in [Seb's answer](http://stackoverflow.com/questions/2878010/regular-expression-for-validating-month/2878016#2878016)
Daniel DiPaolo
2010-05-20 21:41:31
It may not be the more succinct, but it is faster than /^(0[1-9]|1[0-2])$/, even /^0[1-9]|1[0-2]$/, when used with grep against 1,000,000 test data that I generated.
Daniel Trebbien
2010-05-20 22:01:26