复制元素而不使用量词\ d \ d是\ d {2}

import java.util.regex.Matcher;

import java.util.regex.Pattern;/** from n o w j a v a . c o m - 时代Java**/


public class Main {

  public static void main(String[] args) {

    Pattern pattern = Pattern.compile("\\d{2}-\\d\\d");

    Matcher matcher = pattern.matcher("12-12");

    if (matcher.matches())

      System.out.println("Match.");

    else

      System.out.println("Does not match.");

  }


}