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