Java 正则匹配 groupCount 方法

package com.codingdict;



import java.util.regex.Matcher;

import java.util.regex.Pattern;



public class MatcherDemo {



   private static String REGEX = "(a*b)(foo)";

   private static String INPUT = "aabfooaabfooabfoob";

   public static void main(String[] args) {



      Pattern pattern = Pattern.compile(REGEX);



      // get a matcher object

      Matcher matcher = pattern.matcher(INPUT);

      if(matcher.find()) {

     //Prints the number of capturing groups in this matcher's pattern.

          System.out.println("Group Count: "+matcher.groupCount());    

      }      

   }

}