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Matcher group(String) method in Java with Examples

  • Last Updated : 26 Nov, 2018

The group(String string) method of Matcher Class is used to get the group of the match result already done, from the specified string.

Syntax:

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public String group(String string)

Parameters: This method takes a parameter string which is the String from which the group index of the matched pattern is required.

Return Value: This method returns the group of the matched group from the specified string.



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 name.

Below examples illustrate the Matcher.group() method:

Example 1:




// 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 = "\\b(?<Geeks>[A-Za-z\\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("Geeks"));
        }
    }
}
Output:

Current Matcher: java.util.regex.Matcher[pattern=\b(?[A-Za-z\s]+) region=0,13 lastmatch=]
GeeksForGeeks

Example 2:




// 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 = "\\b(?<GFG>[A-Za-z\\s]+)";
  
        // 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("GFG"));
        }
    }
}
Output:

Current Matcher: java.util.regex.Matcher[pattern=\b(?[A-Za-z\s]+) region=0,11 lastmatch=]
GFG FGF GFG

Reference: Oracle Doc




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