title: regular expression to disallow combination of characters
body: <p>I am not very famliar with using anything but very basic regular expression. I have a field that allows all characters except single quote, double quote and question mark (I know, not a good idea, but what can I say. My customers will not budge on this requirement.) Now, a new requirement is added. The character combination of @# is also not allowed. My current regular expression is ^[^?'"]{0,1000}$  How do I now include the requirement of @# as a specific character combination that is not allowed?</p>