# Regular Expression for 1-9 or 01-09 or 10-12

**URL:** <https://forum.kirupa.com/t/regular-expression-for-1-9-or-01-09-or-10-12/296867>\
**Category:** web dev\
**Created:** [September 22, 2009, 2:11am UTC](https://forum.kirupa.com/t/regular-expression-for-1-9-or-01-09-or-10-12/296867 "2009-09-22T02:11:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![kBisk](https://avatars.discourse-cdn.com/v4/letter/k/eb8c5e/32.png) [@kBisk](https://forum.kirupa.com/u/kBisk)\
**Post date:** [September 22, 2009, 2:11am UTC](https://forum.kirupa.com/t/regular-expression-for-1-9-or-01-09-or-10-12/296867/1 "2009-09-22T02:11:23Z")

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I have a regular expression (being used in JavaScript) which successfully passes 01-09 AND 10-12.

It is:  
/0[1-9]|1[012]/.test( someOneOrTwoDigitNumber );

true if: 01,02,…09,10,11,12

However, I cannot figure out how to modify it to allow 1-9 if only a single digit is entered.

Does any one know how? Thanks.