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Showing content from https://www.geeksforgeeks.org/java/matcher-groupcount-method-in-java-with-examples/ below:

Matcher groupCount() method in Java with Examples

Last Updated : 26 Nov, 2018

The

groupCount()

method of

Matcher Class

is used to get the number of capturing groups in this matcher's pattern.

Syntax:

public int groupCount()

Parameters:

This method do not takes any parameter.

Return Value:

This method returns the

number of capturing groups

in this matcher's pattern. Below examples illustrate the Matcher.groupCount() method:

Example 1: Java


 // Java code to illustrate groupCount() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "Geeks";

        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched
            = "GeeksForGeeks";

        // Create a matcher for the input String
        Matcher matcher
            = pattern
                  .matcher(stringToBeMatched);

        // Get the number of capturing groups
        // using groupCount() method
        System.out.println(matcher.groupCount());
    }
}

Example 2: Java


 // Java code to illustrate groupCount() method

import java.util.regex.*;

public class GFG {
    public static void main(String[] args)
    {

        // Get the regex to be checked
        String regex = "GFG";

        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);

        // Get the String to be matched
        String stringToBeMatched
            = "GFGFGFGFGFGFGFGFGFG";

        // Create a matcher for the input String
        Matcher matcher
            = pattern
                  .matcher(stringToBeMatched);

        // Get the number of capturing groups
        // using groupCount() method
        System.out.println(matcher.groupCount());
    }
}

Reference: Oracle Doc

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