How can I display a list of characters that fail to match a regular expression?

Posted by Matt on Stack Overflow See other posts from Stack Overflow or by Matt
Published on 2010-03-19T07:24:24Z Indexed on 2010/03/19 7:31 UTC
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php

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regex

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error-message

For example, if I'm doing some form input validation and I'm using the following code for the name field.

    preg_match("/^[a-zA-Z .-]$/", $firstname);

If someone types in Mr. (Awkward) Double-Barrelled I want to be able to display a message saying Invalid character(s): (, )

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