Function cron::alpha1

pub fn alpha1<T>(input: T) -> Result<(T, T), Err<T, u32>> where
    T: InputTakeAtPosition,
    <T as InputTakeAtPosition>::Item: AsChar, 

Recognizes one or more lowercase and uppercase alphabetic characters For ASCII strings: a-zA-Z For UTF8 strings, any alphabetic code point (ie, not only the ASCII ones)