Function cron::alphanumeric0

pub fn alphanumeric0<T>(input: T) -> Result<(T, T), Err<T, u32>> where
    T: InputTakeAtPosition,
    <T as InputTakeAtPosition>::Item: AsChar, 

Recognizes zero or more numerical and alphabetic characters. For ASCII strings: 0-9a-zA-Z For UTF8 strings, 0-9 and any alphabetic code point (ie, not only the ASCII ones)