#[must_use]pub fn prefixed<T>(s: &str, delim: &str, len: usize) -> Option<T> where
T: FromStr,
T::Err: Debug,
Returns a value prefixed by a delimiter.
self
- The delimited string to search.
delim
- The delimiter prefix.
len
- The length of the prefixed value, in bytes.
If the matched value cannot be parsed to the specified type.