regexp: leave a pointer to resurrect workaround for Homebrew #27056

Job	Run time
config	5s
fuzz smoke test	1m 13s
win+Meson build	5m 42s
static-analysis	5m 41s
win build	5m 15s
osx-clang (macos-14)	20m 33s
osx-meson (macos-14)	20m 40s
osx-gcc (macos-14)	17m 42s
documentation	7m 12s
rust-analysis	1m 28s
sparse	3m 28s
osx-reftable (macos-14)	19m 8s
linux32 (i386/ubuntu:focal)	8m 47s
linux-reftable-leaks (ubuntu:rolling)	27m 59s
win+VS build	0s
linux-reftable (ubuntu:rolling)	14m 29s
linux-meson (ubuntu:rolling)	14m 51s
debian-11 (debian:11)	10m 40s
fedora-breaking-changes-meson (fedora:latest)	10m 59s
almalinux-8 (almalinux:8)	8m 52s
linux-sha256 (ubuntu:rolling)	14m 0s
linux-leaks (ubuntu:rolling)	28m 42s
linux-TEST-vars (ubuntu:20.04)	13m 19s
linux-musl-meson (alpine:latest)	8m 43s
linux-asan-ubsan (ubuntu:rolling)	31m 12s
linux-breaking-changes (ubuntu:rolling)	13m 34s
win+VS test	-23s
win+Meson test (4)	9m 50s
win+Meson test (9)	10m 9s
win+Meson test (5)	7m 51s
win+Meson test (0)	10m 50s
win+Meson test (6)	12m 21s
win+Meson test (3)	7m 10s
win+Meson test (8)	8m 34s
win+Meson test (2)	8m 12s
win+Meson test (7)	7m 15s
win+Meson test (1)	9m 29s
win test (2)	9m 50s
win test (4)	10m 24s
win test (8)	5m 50s
win test (0)	6m 0s
win test (1)	7m 37s
win test (6)	7m 52s
win test (3)	7m 13s
win test (9)	10m 45s
win test (7)	6m 47s
win test (5)	7m 7s
	8h 4m 57s

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