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Matcher group() method in Java with Examples
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Matcher group(int) method in Java with Examples

Last Updated : 26 Nov, 2018
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The group(int group) method of Matcher Class 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 Matcher.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 = "(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(1));         }     } }
Output:
Current Matcher: java.util.regex.Matcher[pattern=(G*s) region=0,13 lastmatch=] s s
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 = "(G*G)";          // 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 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(0));         }     } }
Output:
Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0,19 lastmatch=] G G G G G G G G G G
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#group-int-

Next Article
Matcher group() method in Java with Examples

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Kirti_Mangal
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Article Tags :
  • Java
  • Java - util package
  • Java-Functions
  • Java-Matcher
Practice Tags :
  • Java

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