Hello. I have an app.inputbox piece of code below. I would like prevent
users from using an underscore ( _ ) in the input box. How can I modify the
code below? Thank you!

userinput = Application.InputBox("User Input")
If userinput = False Then
Exit Sub
Else
***if userinput contains an underscore then
msgbox ("cannot use underscores") vbokonly, then bring
them back to the input box for re-entry
else
Run the rest of my code