I once wrote a parser as a huge regex, full of "experimental" features.
I'll never do it again.
I started getting all sorts of weird errors such as segfaults, and they varied wildly between perl versions. I could never find a simple example to reproduce the crash, so I couldn't even file a proper bug report. Also, the huge regex was unmaintainable. Now I'd rather use a parser generator. I'm happy with Parse::YAPP. It's not as trendy as Parse::RecDescent, but it's way faster in my experience.
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