nom::is_not_s

macro_rules! is_not_s {
    ($input:expr, $arr:expr) => { ... };
}

is_not_s!(&str) => &str -> IResult<&str, &str> returns the longest list of characters that do not appear in the provided array

 named!( not_space<&str,&str>, is_not_s!( " \t\r\n" ) );

 let r = not_space("abcdefgh\nijkl");
 assert_eq!(r, Done("\nijkl", "abcdefgh"));