Updated test case

re_test.go

@@ -297,7 +297,7 @@ var groupTests = []struct {
 	{`(a)(b)(c)(d)(e)(f)(g)(h)(i)(j)(k)(l)\071`, nil, `abcdefghijkl9`, []Match{[]Group{{0, 13}, {0, 1}, {1, 2}, {2, 3}, {3, 4}, {4, 5}, {5, 6}, {6, 7}, {7, 8}, {8, 9}, {9, 10}, {10, 11}, {11, 12}}}},
 	{`()ef`, nil, `def`, []Match{[]Group{{1, 3}, {1, 1}}}},
 	{`(?:)ef`, nil, `def`, []Match{[]Group{{1, 3}}}},
-	{`(?:)`, nil, `def`, []Match{[]Group{{0, 0}}, []Group{{1, 1}}, []Group{{2, 2}}}},
+	{`(?:)`, nil, `def`, []Match{[]Group{{0, 0}}, []Group{{1, 1}}, []Group{{2, 2}}, []Group{{3, 3}}}},
 }
 
 func TestFindAllMatches(t *testing.T) {