I have a question field with a list of allowed characters : A-Z,0-9,colon (:), question mark (?), comma(,), hyphen(-), apostrophe ('). I have the regex which works fine, in the fashion :

 $question->addValidator('regex', true, array(<regular expresstion>))

The default error message is something like ''' does not match against pattern ''

I want to write a custom error message that says ' is not allowed in this field'

Is there a simple way to do it using the existing zend components that I'm missing?

Is writing a custom validator the only way to achieve what I'm trying to achieve? If yes, how do I write a custom validator (I looked at the documentation and didn't quite understand how I can customize the error messages) If there is any other way, I'd most appreciate that input too.

Thanks for taking the time to answer this!