Matcher group(String) method in Java with Examples - GeeksforGeeks

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:
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"));        }    }}
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"));        }    }}
Current Matcher: java.util.regex.Matcher[pattern=\b(?[A-Za-z\s]+) region=0,11 lastmatch=]GFG FGF GFG
Reference: Oracle Doc
Java - util package
Java-Functions
Java-Matcher
Java
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