Merge branch 'ab/bsd-fixes'

Test portability fix.

* ab/bsd-fixes:
  commit-graph tests: fix unportable "dd" invocation
  tests: fix unportable "\?" and "\+" regex syntax

t/t5318-commit-graph.sh

@@ -382,7 +382,7 @@ corrupt_graph_and_verify() {
 	test_when_finished mv commit-graph-backup $objdir/info/commit-graph &&
 	cp $objdir/info/commit-graph commit-graph-backup &&
 	printf "$data" | dd of="$objdir/info/commit-graph" bs=1 seek="$pos" conv=notrunc &&
-	dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" count=0 &&
+	dd of="$objdir/info/commit-graph" bs=1 seek="$zero_pos" if=/dev/null &&
 	generate_zero_bytes $(($orig_size - $zero_pos)) >>"$objdir/info/commit-graph" &&
 	test_must_fail git commit-graph verify 2>test_err &&
 	grep -v "^+" test_err >err &&

t/t6120-describe.sh

@@ -146,7 +146,7 @@ check_describe A-* HEAD
 test_expect_success 'describe works from outside repo using --git-dir' '
 	git clone --bare "$TRASH_DIRECTORY" "$TRASH_DIRECTORY/bare" &&
 	git --git-dir "$TRASH_DIRECTORY/bare" describe >out &&
-	grep "^A-[1-9][0-9]\?-g[0-9a-f]\+$" out
+	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+$" out
 '
 check_describe "A-*[0-9a-f]" --dirty
@@ -156,7 +156,7 @@ test_expect_success 'describe --dirty with --work-tree' '
 		cd "$TEST_DIRECTORY" &&
 		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
 	) &&
-	grep "^A-[1-9][0-9]\?-g[0-9a-f]\+$" out
+	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+$" out
 '
 test_expect_success 'set-up dirty work tree' '
@@ -170,7 +170,7 @@ test_expect_success 'describe --dirty with --work-tree (dirty)' '
 		cd "$TEST_DIRECTORY" &&
 		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty >"$TRASH_DIRECTORY/out"
 	) &&
-	grep "^A-[1-9][0-9]\?-g[0-9a-f]\+-dirty$" out
+	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+-dirty$" out
 '
 check_describe "A-*[0-9a-f].mod" --dirty=.mod
@@ -180,7 +180,7 @@ test_expect_success 'describe --dirty=.mod with --work-tree (dirty)' '
 		cd "$TEST_DIRECTORY" &&
 		git --git-dir "$TRASH_DIRECTORY/.git" --work-tree "$TRASH_DIRECTORY" describe --dirty=.mod >"$TRASH_DIRECTORY/out"
 	) &&
-	grep "^A-[1-9][0-9]\?-g[0-9a-f]\+.mod$" out
+	grep -E "^A-[1-9][0-9]?-g[0-9a-f]+.mod$" out
 '
 test_expect_success 'describe --dirty HEAD' '