Hi folks. I've modified my code to use str.startswith instead of re.match. I had a one-to-one correspondence between filenames and regexes anyway, so it doesn't really sacrifice anything.
This way the original app (music-pipeline) is nice and fast now on pypy3 7.3.3. I'm leaving the various SSCCE's at https://stromberg.dnsalias.org/svn/regex-fodder/trunk in case someone wants to use them to replicate the problem going forward. They're commented to describe what they do and whether they are fast or slow. As Carl said, the issue seems to be that pypy3 7.3.3 doesn't like having very many regular expressions in the same program - even if only one compiled regex exists at any given time (no-longer-needed regexes disposed of with del). Thanks again!
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