I have often built recursive-descent parsers for various projects, when Parse::RecDescent
would have sufficed. I once built an entire XML parser out of pure perl, when expat was just laying about ready to be attached to a perl module. Fortunately Larry Wall had more sense than I.
My other major lossage was recreating a lot matrix algorithms before learning about the Perl Data Language PDL.
Moral: Always looks for a wheel first, even if you want to roll your own. It will always turn out better :)
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