regular expression for special characters

I am using this regular expression for validating email address for exampl开发者_运维百科e:

ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"

and now I want to write a validation expression for not using one special character, like ";" in my example...

P.S. I know how to do this in JavaScript with the keyCode function for example, but I need it as a simple regular expression...

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I'm guessing that you're looking for an entirely new regex that has nothing to do with your email regex, and that the only rule for this regex is: "Match any string that does not contain a semicolon."

This is easy. Use the following regex:

^[^;]*$

Explanation:

^ matches the start of the string.

[^;]* is a negated character class. As the first character inside brackets, the ^ takes on a new meaning as "anything but". So this expression means "Match a character unless it's a semicolon". The * allows any number of repetitions, including zero.

$ matches the end of the string.