Do you know of answer that's actually in one of those links? I've read each of those pages several times over the last 18 years and I can't think of any obvious answer covered there. Certainly there may be something, but nothing obvious, I'm pretty sure.
Yes. I do know that the answer is there if you look hard enough. You might have to read between the lines though.
So you really did read those docs? If so, you found that regexes don't work the way you want them to. That means that you have to find another way to achieve the end result.