grep: add a test asserting that --perl-regexp dies when !PCRE
Add a test asserting that when --perl-regexp (and -P for grep) is given to git-grep & git-log that we die with an error. In developing the PCRE v2 series I introduced a regression where -P would (through control-flow fall-through) become synonymous with basic POSIX matching. I.e. 'git grep -P '[\d]' would match "d" instead of digits. The entire test suite would still pass with this serious regression, since everything that tested for --perl-regexp would be guarded by the PCRE prerequisite, fix that blind-spot by adding tests under !PCRE asserting that git must die when given --perl-regexp or -P. Signed-off-by: NÆvar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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