The program is going to look substantially the same if I use pcre to check for ".txt" and split up words. And, if you read the original C++ article, it is not at all about comparing regex interfaces!

So, no, I don't think you're right about this.

More to the point, though: I'm talking about regex libraries because the parent comment is. My point: the Rust example uses 3p dependencies, so what C does "out of the box" is already out the window.