I ran into an odd issue... the workaround is easy enough but the issue is weird. In case this relevant, my grep coms from git bash. (which I think is mostly Cygwin? (or maybe msys2??)) Anyway, grep -P doesn't work if no LC vars are set, and complains that it only works in unibyte locales or UTF-8. Normally, the git bash mintty launcher sets LC_CTYPE to en_us.UTF-8 but not if I bypass the launcher and run grep directly. Here's the weird part, if I ask /usr/bin/locale what LC_TYPE "should" be, it says C.UTF-8. If I run grep with C.UTF-8 then it also works. So it must be deriving a default locale an different way. But how?
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