diff --git a/t/README b/t/README
index 428ee05c4a5b844815ff4f9356b71bb147cb42a6..238729c5b7168919ab6f79cf0a0b11c4833ddeae 100644
--- a/t/README
+++ b/t/README
@@ -587,6 +587,11 @@ use these, and "test_set_prereq" for how to define your own.
    Test is not run by root user, and an attempt to write to an
    unwritable file is expected to fail correctly.
 
+ - LIBPCRE
+
+   Git was compiled with USE_LIBPCRE=YesPlease. Wrap any tests
+   that use git-grep --perl-regexp or git-grep -P in these.
+
 Tips for Writing Tests
 ----------------------
 
diff --git a/t/t7810-grep.sh b/t/t7810-grep.sh
index 8184c264cf942bcd8e6c2f75b5526ddfdc5a11e9..e845218f67a4d14160900884bb0b0d9c8785ba97 100755
--- a/t/t7810-grep.sh
+++ b/t/t7810-grep.sh
@@ -26,6 +26,12 @@ test_expect_success setup '
 		echo foo mmap bar_mmap
 		echo foo_mmap bar mmap baz
 	} >file &&
+	{
+		echo Hello world
+		echo HeLLo world
+		echo Hello_world
+		echo HeLLo_world
+	} >hello_world &&
 	echo vvv >v &&
 	echo ww w >w &&
 	echo x x xx x >x &&
@@ -599,4 +605,36 @@ test_expect_success 'grep -e -- -- path' '
 	test_cmp expected actual
 '
 
+cat >expected <<EOF
+hello.c:int main(int argc, const char **argv)
+hello.c:	printf("Hello world.\n");
+EOF
+
+test_expect_success LIBPCRE 'grep --perl-regexp pattern' '
+	git grep --perl-regexp "\p{Ps}.*?\p{Pe}" hello.c >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success LIBPCRE 'grep -P pattern' '
+	git grep -P "\p{Ps}.*?\p{Pe}" hello.c >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success LIBPCRE 'grep -P -i pattern' '
+	{
+		echo "hello.c:	printf(\"Hello world.\n\");"
+	} >expected &&
+	git grep -P -i "PRINTF\([^\d]+\)" hello.c >actual &&
+	test_cmp expected actual
+'
+
+test_expect_success LIBPCRE 'grep -P -w pattern' '
+	{
+		echo "hello_world:Hello world"
+		echo "hello_world:HeLLo world"
+	} >expected &&
+	git grep -P -w "He((?i)ll)o" hello_world >actual &&
+	test_cmp expected actual
+'
+
 test_done
diff --git a/t/test-lib.sh b/t/test-lib.sh
index abc47f3abc5d925ed217d0d95f10bf078bc26034..d3ed59803f6e7c91a60cbabd38419ab0c8f8a797 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1067,6 +1067,7 @@ esac
 
 test -z "$NO_PERL" && test_set_prereq PERL
 test -z "$NO_PYTHON" && test_set_prereq PYTHON
+test -n "$USE_LIBPCRE" && test_set_prereq LIBPCRE
 
 # Can we rely on git's output in the C locale?
 if test -n "$GETTEXT_POISON"