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When 1819ad327b (grep: fix multibyte regex handling under macOS, 2022-08-26) started to use the native regex library instead of Git's own (compat/regex/), it lost support for alternation in basic regular expressions. Bring it back by enabling the flag REG_ENHANCED on macOS when compiling basic regular expressions. Reported-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com> Suggested-by: Jeff King <peff@peff.net> Signed-off-by: René Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>