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in reply to Re^2: Regex replace leaking memory.
in thread Regex replace leaking memory.

Thanks for the update.

I also cannot reproduce on Centos 7.8.2003:

This is perl 5, version 30, subversion 0 (v5.30.0) built for x86_64-li +nux

One difference between yours and mine is that yours are all multithreaded, with the failing ones being gnu-thread-multi. I don't know if that has any relevance, but hopefully others can comment on that.

Update:

I also tested under an Ubuntu version 18 with the system perl, version 5.26.1 x86_64-linux-gnu-thread-multi, and could not reproduce.