1package regexp2
2
3import "testing"
4
5func TestRightToLeft_Basic(t *testing.T) {
6	re := MustCompile(`foo\d+`, RightToLeft)
7	s := "0123456789foo4567890foo1foo  0987"
8
9	m, err := re.FindStringMatch(s)
10	if err != nil {
11		t.Fatalf("Unexpected err: %v", err)
12	}
13	if want, got := "foo1", m.String(); want != got {
14		t.Fatalf("Match 0 failed, wanted %v, got %v", want, got)
15	}
16
17	m, err = re.FindNextMatch(m)
18	if err != nil {
19		t.Fatalf("Unexpected err: %v", err)
20	}
21	if want, got := "foo4567890", m.String(); want != got {
22		t.Fatalf("Match 1 failed, wanted %v, got %v", want, got)
23	}
24}
25
26func TestRightToLeft_StartAt(t *testing.T) {
27	re := MustCompile(`\d`, RightToLeft)
28
29	m, err := re.FindStringMatchStartingAt("0123", -1)
30	if err != nil {
31		t.Fatalf("Unexpected err: %v", err)
32	}
33	if m == nil {
34		t.Fatalf("Expected match")
35	}
36	if want, got := "3", m.String(); want != got {
37		t.Fatalf("Find failed, wanted '%v', got '%v'", want, got)
38	}
39
40}
41
42func TestRightToLeft_Replace(t *testing.T) {
43	re := MustCompile(`\d`, RightToLeft)
44	s := "0123456789foo4567890foo         "
45	str, err := re.Replace(s, "#", -1, 7)
46	if err != nil {
47		t.Fatalf("Unexpected err: %v", err)
48	}
49	if want, got := "0123456789foo#######foo         ", str; want != got {
50		t.Fatalf("Replace failed, wanted '%v', got '%v'", want, got)
51	}
52}
53