I was curious if this would be smart enough to generate a regex for any four letter word so I copied the tagline of the site and highlighted all four letter wor

I was curious if this would be smart enough to generate a regex for any four letter word so I copied the tagline of the site and highlighted all four letter words in it. (I have deleted the previous highlights of course.) It generated three regexes that just had a union of those words and one which started off good-ish by looking for any word of length of three or four, but then tacked on some random suffix and in the end this most promising regex turned out to not even match anything in the source text. As a suggestion to the authors of this tool I'd propose to add a step where any generated regexes that don't match anything in the input text are removed from the results.