正则表达式参考组

import java.util.regex.Matcher;

import java.util.regex.Pattern;


public class Main {
/**
来 自 nowjava.com - 时代Java
**/

  public static void main(String[] args) {

    Pattern pattern = Pattern.compile("\\w(\\d)-\\w\\1");

    Matcher matcher = pattern.matcher("r2-d2");

    if (matcher.matches())

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

    else

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

  }


}