Method ci_eq

std/re/src/main/matcher.rs:234–237

(&self, a: char, b: char)

    }

    fn ci_eq(&self, a: char, b: char) -> bool {
        if a == b { return true; }
        if self.flags.ignorecase { a.to_lowercase().eq(b.to_lowercase()) } else { false }
    }

    fn at_start(&self, pos: usize) -> bool {
        pos == 0 || (self.flags.multiline && pos > 0 && self.input[pos - 1] == '\n')