ReqDigit.max constructor
Constrains the input data to the digits 0-9
and its length (number of
digits) to a maximum of max
digits.
max
the maximum number of digits; it must be > 0.
blank
the error message in case of a null or empty input value.
mal
the error message if a non-digit character is found.
long
the error message if the input length is longer than max
digits.
Implementation
ReqDigit.max(int max, {String? blank, String? mal, String? long})
: this._dig(Digit.max(max, mal: mal, long: long), blank);