Function indexOf [src]

Search for needle in haystack and return the index of the first occurrence. Uses Boyer-Moore-Horspool algorithm on large inputs; linear search on small inputs. Returns null if needle is not found.

Prototype

pub fn indexOf(comptime T: type, haystack: []const T, needle: []const T) ?usize

Parameters

T: typehaystack: []const Tneedle: []const T

Example

 test indexOf {
    try testing.expect(indexOf(u8, "one two three four five six seven eight nine ten eleven", "three four").? == 8);
    try testing.expect(lastIndexOf(u8, "one two three four five six seven eight nine ten eleven", "three four").? == 8);
    try testing.expect(indexOf(u8, "one two three four five six seven eight nine ten eleven", "two two") == null);
    try testing.expect(lastIndexOf(u8, "one two three four five six seven eight nine ten eleven", "two two") == null);

    try testing.expect(indexOf(u8, "one two three four five six seven eight nine ten", "").? == 0);
    try testing.expect(lastIndexOf(u8, "one two three four five six seven eight nine ten", "").? == 48);

    try testing.expect(indexOf(u8, "one two three four", "four").? == 14);
    try testing.expect(lastIndexOf(u8, "one two three two four", "two").? == 14);
    try testing.expect(indexOf(u8, "one two three four", "gour") == null);
    try testing.expect(lastIndexOf(u8, "one two three four", "gour") == null);
    try testing.expect(indexOf(u8, "foo", "foo").? == 0);
    try testing.expect(lastIndexOf(u8, "foo", "foo").? == 0);
    try testing.expect(indexOf(u8, "foo", "fool") == null);
    try testing.expect(lastIndexOf(u8, "foo", "lfoo") == null);
    try testing.expect(lastIndexOf(u8, "foo", "fool") == null);

    try testing.expect(indexOf(u8, "foo foo", "foo").? == 0);
    try testing.expect(lastIndexOf(u8, "foo foo", "foo").? == 4);
    try testing.expect(lastIndexOfAny(u8, "boo, cat", "abo").? == 6);
    try testing.expect(lastIndexOfScalar(u8, "boo", 'o').? == 2);
}

Source

  pub fn indexOf(comptime T: type, haystack: []const T, needle: []const T) ?usize {
    return indexOfPos(T, haystack, 0, needle);
}  