The group(int group) method of MatchResult Interface 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 MatchResult.group() method:
Example 1:
// 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 = "(Geeks)"; // Create a pattern from regex Pattern pattern = Pattern.compile(regex); // Get the String to be matched String stringToBeMatched = "Geeks For Geeks"; // Create a matcher for the input String MatchResult matcher = pattern .matcher(stringToBeMatched); while (((Matcher)matcher).find()) { // Get the group matched using group() method System.out.println(matcher.group(1)); } }} |
Output:
Geeks Geeks
Example 2:
// 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 = "(GFG)"; // Create a pattern from regex Pattern pattern = Pattern.compile(regex); // Get the String to be matched String stringToBeMatched = "GFG FGFGFGFGFGFGF GFG"; // Create a matcher for the input String MatchResult matcher = pattern .matcher(stringToBeMatched); while (((Matcher)matcher).find()) { // Get the group matched using group() method System.out.println(matcher.group(0)); } }} |
Output:
GFG GFG GFG GFG GFG
