I need validation to fail on an apostrophe entered into a textbox for my regularexpression validator

<asp:RegularExpressionValidator id="valRegEx" runat="server"
ControlToValidate="textbox1"
ValidationExpression=" "
ErrorMessage="* Please only enter alphanumeric values and make sure
you are not entering in any apostrophes."
display="dynamic">*


I need

"Chris's mail"

to fail the above validation - which I believe means I need the
regular expression to return a no match on the above line.

Can you help?

Many thanks,
Chris

.

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