Added more tests

re_test.go

@@ -56,6 +56,13 @@ var reTests = []struct {
 	{"[Ff]r[Uu|]it", "Fr|it", []matchIndex{{0, 5}}},
 	{"[Ff]r([Uu]|[pP])it", "Frpit", []matchIndex{{0, 5}}},
 	{"[Ff]r[Uu]|[pP]it", "Frpit", []matchIndex{{2, 5}}},
+	{"[a-zA-Z]+", "Hello, how is it going?", []matchIndex{{0, 5}, {7, 10}, {11, 13}, {14, 16}, {17, 22}}},
+
+	{".+", "Hello, how is it going?", []matchIndex{{0, 23}}},
+	{"a.", "a ", []matchIndex{{0, 2}}},
+	{"a.b", "a/b", []matchIndex{{0, 3}}},
+	{".", "a ", []matchIndex{{0, 2}}},
+	{"a.", "a ", []matchIndex{{0, 2}}},
 }
 
 func TestFindAllMatches(t *testing.T) {