regular expression where underscore NOT in string.
I have a text box I want to make sure an underscore (_) character is NOT included anywhere. I have added a regular expression validator but I can't work out what the regular expression should be. I thought it would be simple but apparently it isn't.
Basically I have tried
None of these work. All I want is to make sure there is no underscore in the text. Please can someone give me the regular expression for testing that.