The group() method of Matcher Class is used to get the input subsequence matched by the previous match result.
Syntax:
public String group()
Parameters: This method do not takes any parameter.
Return Value: This method returns the String which is the input subsequence matched by the previous match.
Exception: This method throws IllegalStateException if no match has yet been attempted, or if the previous match operation failed.
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 = "(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());
}
}
} |
Current Matcher: java.util.regex.Matcher[pattern=(G*s) region=0, 13 lastmatch=]
s
s
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 = "(G*G)" ;
// 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());
}
}
} |
Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0, 11 lastmatch=]
G
G
G
G
G
Reference: Oracle Doc