ItemType Pattern No Space

Good day all.  Can someone tell me how to set the Pattern for an ItemType Property to not allow spaces?  I read the Tech Tip: Enforce Property Formats Using Regular Expressions and looked at the Regex link provided, but have not been able to make anything work.  

I have tried  [\s], [^\s], and [^\s-], but those throw an errors if there is not a space.  Thank you for any help that you can provide.