grep: add a test for backreferences in PCRE patterns

Add a test for backreferences such as (.)\1 in PCRE patterns. This test ensures that the PCRE_NO_AUTO_CAPTURE option isn't turned on. Before this change turning it on would break these sort of patterns, but wouldn't break any tests. Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]> Signed-off-by: Junio C Hamano <[email protected]>
slstoneslei · May 20, 2017 · 4aeb720 · 4aeb720
1 parent 9001c19
commit 4aeb720
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
@@ -1114,6 +1114,13 @@ test_expect_success PCRE 'grep -P -w pattern' '
 	test_cmp expected actual
 '
 
+test_expect_success PCRE 'grep -P backreferences work (the PCRE NO_AUTO_CAPTURE flag is not set)' '
+	git grep -P -h "(?P<one>.)(?P=one)" hello_world >actual &&
+	test_cmp hello_world actual &&
+	git grep -P -h "(.)\1" hello_world >actual &&
+	test_cmp hello_world actual
+'
+
 test_expect_success 'grep -G invalidpattern properly dies ' '
 	test_must_fail git grep -G "a["
 '