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Reg. Expr. using Pattern - Invalidate a String, if it contains certain characters

 
Sam Gehouse
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I admit that I am not good with regular expression. If any of you is good with regular expression, could you please suggest a pattern that will help me?

This is the problem statement:
If an input String contains any of the following 16 characters (e.g. !, @, =, etc.) that that input String is invalid.
 
Rob Spoor
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Check out character classes on the java.util.regex.Pattern Javadoc page.
 
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