Function calculate_match_range 

pub fn calculate_match_range(
    line: usize,
    line_content: &str,
    match_start: usize,
    match_len: usize,
) -> (usize, usize, usize, usize)

Calculate range from regex match on a line

Safety

This function safely handles multi-byte UTF-8 characters by ensuring all string slicing operations occur at valid character boundaries.