countUntilLastOccurrenceOf

1 import std.conv : to;
2 
3 {
4     enum haystack = "haystack";
5     enum needle = "a";
6     enum index = haystack.countUntilLastOccurrenceOf(needle);
7     assert((index == 5), index.to!string);
8 }
9 {
10     enum haystack = "1234567890";
11     enum needle = '7';
12     immutable index = haystack.countUntilLastOccurrenceOf(needle);
13     assert((index == 6), index.to!string);
14 }
15 {
16     enum haystack = "123456789";
17     enum needle = '0';
18     immutable index = haystack.countUntilLastOccurrenceOf(needle);
19     assert((index == -1), index.to!string);
20 }
21 {
22     enum haystack = "1234567890";
23     enum needle = "";
24     immutable index = haystack.countUntilLastOccurrenceOf(needle);
25     static assert((index == 0), index.to!string);
26 }
27 {
28     enum haystack = "";
29     enum needle = "";
30     immutable index = haystack.countUntilLastOccurrenceOf(needle);
31     assert((index == 0), index.to!string);
32 }
33 {
34     enum haystack = "";
35     enum needle = "blarp";
36     immutable index = haystack.countUntilLastOccurrenceOf(needle);
37     assert((index == -1), index.to!string);
38 }
39 {
40     static immutable haystack = [ 1, 2, 3, 4, 5, 1, 2, 3 ];
41     enum needle = 1;
42     immutable index = haystack.countUntilLastOccurrenceOf(needle);
43     assert((index == 5), index.to!string);
44 }
45 {
46     static immutable haystack = [ 1, 2, 3, 1, 2, 3, 4, 5, 6 ];
47     static immutable needle = [ 1, 2, 3 ];
48     immutable index = haystack.countUntilLastOccurrenceOf(needle);
49     assert((index == 3), index.to!string);
50 }
51 {
52     enum haystack= "abcdefabcdefabc";
53     enum needle = "fab";
54     immutable index = haystack.countUntilLastOccurrenceOf(needle);
55     assert((index == 11), index.to!string);
56 }