Matcher group() method in Java with Examples

Last Updated : 26 Nov, 2018

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:

Java

// 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());  }  } }

Output:

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

Example 2:

Java

// 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());  }  } }