How do I identify a sentence with regex?

Hi Guys, I need help. Is there a way to identify a sentence that has only one word using regex?

Thanks in Advance.

This tutorial is very detailed: https://www.scirra.com/tutorials/1337/e ... onstruct-2

And this site may help you test your regex: https://regexr.com/

If you need something more specific, give us more details about it or share a capx that I'll be glad to take a look at it.

Hope this helps. Cheers!

Ok, I should warn that I have zero experience with regex and this is my first ever regex pattern.

I was stunned when I got it right from the first attempt!

RegexMatchAt(text, "[.|!|?]\s+(\w+[.|!|?])", "i", 1)[/code:3imwggfy]

There is at least one problem with it - if the one-word sentence is in the beginning of the text, it won't be caught.
Also, it only searches for well-formatted sentences ending either with full stop, exclamation mark or question mark. 
There may be other issues. But hey, I'm still proud!

brunopalermo dop2000, thanks alot guys. I will try them.