How can I validate a "does not match" type using CodeIgniter's Form Validation class?

Posted by Shamoon on Stack Overflow See other posts from Stack Overflow or by Shamoon
Published on 2010-04-20T13:05:45Z Indexed on 2010/04/20 16:53 UTC
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I want to ensure that a certain text field does not contain a specific value. Is there any way for me to do this using CI's Form Validation class or do I have to write my own extension for it?

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