I’m looking to get respondents to submit “the first word that comes to your mind” on a certain topic, and want to ensure they only submit 1 word. As part of this, I want to forbid respondents from entering any spaces in their answer. I tried using the custom validation to do this, but am not having any luck (tried putting a space in there, and an “s” after googling that may be the regex version of a space?).

Does anyone know if custom CSS might be the solution here? And if so, what that code might look like?