Matcher group() method in Java with Examples

The group() method of Matcher Class is used to get the input subsequence matched by the previous match result.

Syntax:

public String group()

Parameters: This method do not takes any parameter.



Return Value: This method returns the String which is the input subsequence matched by the previous match.

Exception: This method throws IllegalStateException if no match has yet been attempted, or if the previous match operation failed.

Below examples illustrate the Matcher.group() method:

Example 1:

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// Java code to illustrate end() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "(G*s)";
  
        // 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 current matcher state
        MatchResult result
            = matcher.toMatchResult();
        System.out.println("Current Matcher: "
                           + result);
  
        while (matcher.find()) {
            // Get the group matched using group() method
            System.out.println(matcher.group());
        }
    }
}

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Output:

Current Matcher: java.util.regex.Matcher[pattern=(G*s) region=0, 13 lastmatch=]
s
s

Example 2:

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// Java code to illustrate end() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "(G*G)";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GFG FGF GFG";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern
                  .matcher(stringToBeMatched);
  
        // Get the current matcher state
        MatchResult result
            = matcher.toMatchResult();
        System.out.println("Current Matcher: "
                           + result);
  
        while (matcher.find()) {
            // Get the group matched using group() method
            System.out.println(matcher.group());
        }
    }
}

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Output:

Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0, 11 lastmatch=]
G
G
G
G
G

Reference: Oracle Doc



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