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Fix widely supported but non-POSIX basic regex syntax introduced in
[1] and [2]. On GNU, NetBSD and FreeBSD the following works:
$ echo xy >f
$ grep 'xy\?' f; echo $?
xy
0
The same goes for "\+". The "?" and "+" syntax is not in the BRE
syntax, just in ERE, but on some implementations it can be invoked by
prefixing the meta-operator with "\", but not on OpenBSD:
$ uname -a
OpenBSD obsd.my.domain 6.2 GENERIC#132 amd64
$ grep --version
grep version 0.9
$ grep 'xy\?' f; echo $?
1
Let's fix this by moving to ERE syntax instead, where "?" and "+" are
universally supported:
$ grep -E 'xy?' f; echo $?
xy
0
1. 2ed5c8e ("describe: setup working tree for --dirty", 2019-02-03)
2. c801170 ("t6120: test for describe with a bare repository",
2019-02-03)
Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>
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