MatchResult group(int) method in Java with Examples
Last Updated :
27 Nov, 2018
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:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(Geeks)" ;
Pattern pattern
= Pattern.compile(regex);
String stringToBeMatched
= "Geeks For Geeks" ;
MatchResult matcher
= pattern
.matcher(stringToBeMatched);
while (((Matcher)matcher).find()) {
System.out.println(matcher.group( 1 ));
}
}
}
|
Example 2:
import java.util.regex.*;
public class GFG {
public static void main(String[] args)
{
String regex = "(GFG)" ;
Pattern pattern
= Pattern.compile(regex);
String stringToBeMatched
= "GFG FGFGFGFGFGFGF GFG" ;
MatchResult matcher
= pattern
.matcher(stringToBeMatched);
while (((Matcher)matcher).find()) {
System.out.println(matcher.group( 0 ));
}
}
}
|
Output:
GFG
GFG
GFG
GFG
GFG
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