# Restricting numbers

**URL:** <https://forum.kirupa.com/t/restricting-numbers/269664>\
**Category:** Uncategorized\
**Created:** [August 30, 2008, 6:11am UTC](https://forum.kirupa.com/t/restricting-numbers/269664 "2008-08-30T06:11:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![olaster](https://avatars.discourse-cdn.com/v4/letter/o/ea5d25/32.png) [@olaster](https://forum.kirupa.com/u/olaster)\
**Post date:** [August 30, 2008, 6:11am UTC](https://forum.kirupa.com/t/restricting-numbers/269664/1 "2008-08-30T06:11:39Z")

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Hi,

I would like to restrict user input to numbers only between letters.  
for example: the user is allowed to input “a2b”, but “2ab” or “ab2” isn’t allowed.  
Any ideas?