MatchResult group(int) method in Java with Examples

Last Updated : 27 Nov, 2018
The group(int group) method of MatchResult Interface is used to get the group index of the match result already done, from the specified group. Syntax: 
public String group(int group)
Parameters: This method takes a parameter group which is the group from which the group index of the matched pattern is required. Return Value: This method returns the index of the first character matched from the specified group. Exception: This method throws:
  • IllegalStateException if no match has yet been attempted, or if the previous match operation failed.
  • IndexOutOfBoundsException if there is no capturing group in the pattern with the given index.
Below examples illustrate the MatchResult.group() method: Example 1: Java 
// Java code to illustrate group() 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
            = "Geeks For Geeks";

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

        while (((Matcher)matcher).find()) {
            // Get the group matched using group() method
            System.out.println(matcher.group(1));
        }
    }
}
Output: 
Geeks
Geeks
Example 2: Java 
// Java code to illustrate group() 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
            = "GFG FGFGFGFGFGFGF GFG";

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

        while (((Matcher)matcher).find()) {
            // Get the group matched using group() method
            System.out.println(matcher.group(0));
        }
    }
}
Output: 
GFG
GFG
GFG
GFG
GFG
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