asp.net RegularExpressionValidator在多行文本框中不起作用

Question

I am using RegularExpressionValidator to stop the user from using the apostrophe (symbol '). This is working fine in single line textbox. But it always shows error message when the user uses the enter key for new line. The ValidationExpression I am using is:ValidationExpression="^(?:(?!['].))*$"

And this is the code: ErrorMessage="You are not allowed to use apostorphene" ControlToValidate="tbDrivingLicenseOther"
ValidationExpression="^(?:(?!['].))*$">

Can not find the solution anywhere on the web. Can anyone help?

Answer 1

It isn't clear for me, what are you actually trying to prevent along with apostrophs with your current RegEx... but the following expression:

ValidationExpression="^[^']*$"

prevents input of apostrophes only in both TextBox and multi-line TextBox.