# Validating a Tag

**URL:** <https://www.ruby-forum.com/t/validating-a-tag/155407>\
**Category:** Rails\
**Created:** [December 11, 2008, 3:34pm UTC](https://www.ruby-forum.com/t/validating-a-tag/155407 "2008-12-11T15:34:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![elioncho](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/ed8c4c/32.png) [@elioncho](https://www.ruby-forum.com/u/elioncho)\
**Post date:** [December 11, 2008, 3:34pm UTC](https://www.ruby-forum.com/t/validating-a-tag/155407/1 "2008-12-11T15:34:03Z")

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Hello,

I am using the acts\_as\_taggable\_on plugin (which derivates from  
acts\_as\_taggable\_on\_steroids). My question is: How can I validate that  
my tags doesn’t have any special characters such as . / \ etc. It  
seems this validations are not included in the plugin. Can you give me  
any guide in which is the best way to make this validations?

Thanks again,

Elías

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<div class="post-metadata">

**Author:** ![elioncho](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/ed8c4c/32.png) [@elioncho](https://www.ruby-forum.com/u/elioncho)\
**Post date:** [December 12, 2008, 5:54am UTC](https://www.ruby-forum.com/t/validating-a-tag/155407/2 "2008-12-12T05:54:09Z")

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Anyone can point me in a direction?