Zig 0.17.0-dev (Split by item)

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findIgnoreCasePos

Finds needle in haystack, ignoring case, starting at start_index. Uses Boyer-Moore-Horspool algorithm on large inputs; findIgnoreCasePosLinear on small inputs.

ascii.findIgnoreCasePos

pub fn findIgnoreCasePos(haystack: []const u8, start_index: usize, needle: []const u8) ?usize

File

lib/std/ascii.zig:388

Code

pub fn findIgnoreCasePos(haystack: []const u8, start_index: usize, needle: []const u8) ?usize {
    if (needle.len > haystack.len) return null;
    if (needle.len == 0) return start_index;

    if (haystack.len < 52 or needle.len <= 4)
        return findIgnoreCasePosLinear(haystack, start_index, needle);

    var skip_table: [256]usize = undefined;
    boyerMooreHorspoolPreprocessIgnoreCase(needle, skip_table[0..]);

    var i: usize = start_index;
    while (i <= haystack.len - needle.len) {
        if (eqlIgnoreCase(haystack[i .. i + needle.len], needle)) return i;
        i += skip_table[toLower(haystack[i + needle.len - 1])];
    }

    return null;
}