nom::count

macro_rules! count {
    ($i:expr, $submac:ident!( $($args:tt)* ), $count: expr) => { ... };
    ($i:expr, $f:expr, $count: expr) => { ... };
}

count!(I -> IResult<I,O>, nb) => I -> IResult<I, Vec<O>> Applies the child parser a specified number of times

 named!(counter< Vec<&[u8]> >, count!( tag!( "abcd" ), 2 ) );

 let a = b"abcdabcdabcdef";
 let b = b"abcdefgh";
 let res = vec![&b"abcd"[..], &b"abcd"[..]];

 assert_eq!(counter(&a[..]), Done(&b"abcdef"[..], res));
 assert_eq!(counter(&b[..]), Error(Position(ErrorKind::Count, &b[..])));