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regexec() only gained the perl argument in R 4.1.0. The CI matrix
covers oldrel-1 through oldrel-4 (R 3.x/4.0.x), so perl=TRUE caused
an 'unused argument' error on every message_() call in those
environments.
All four affected regexec() calls use POSIX-extended compatible
patterns, so dropping perl=TRUE is safe.
https://claude.ai/code/session_01XHWLohiSTdZvCutwD7ag2b