Digit() публичный статический Метод

Returns a pattern that matches a character from the digit character class.
public static Digit ( ) : CharGrouping
Результат CharGrouping
Документация по классу Chars
Пример #1
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 /// <summary>
 /// Appends a pattern that matches a character from the digit character class.
 /// </summary>
 /// <returns></returns>
 public CharGrouping Digit() => Append(Chars.Digit());