The group() method of Matcher Class is used to get the input subsequence matched by the previous match result.
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:
Current Matcher: java.util.regex.Matcher[pattern=(G*s) region=0, 13 lastmatch=]
Current Matcher: java.util.regex.Matcher[pattern=(G*G) region=0, 11 lastmatch=]
Reference: Oracle Doc
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