java.util.regex.Matcher.groupCount() Method

Description

The java.time.Matcher.groupCount() method returns the number of capturing groups in this matcher's pattern.

Declaration

Following is the declaration for java.time.Matcher.groupCount() method.

public int groupCount()

Return Value

The number of capturing groups in this matcher's pattern.

Example

The following example shows the usage of java.time.Matcher.groupCount() method.

package com.tutorialspoint;

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());    
      }      
   }
}

Let us compile and run the above program, this will produce the following result −

Group Count: 2