special flags can change behavior of the pattern matching re case insensitive pattern matching re or will match at beginning/end of each line (not only at the beginning/end of stringre also matches newline \ re findall abc abc nabc [re findall abc abc nabc re abc 're findall abc abc nabc re re abc abc 're findall abc abc nabc [re findall abc abc nabc re abc 'member of the helmholtz association slide