The groupCount() method of MatchResult Interface is used to get the number of capturing groups in this matcher’s pattern. This method returns an integer value which is the number of groups found while matching this matcher.
Syntax:
public int groupCount()
Parameters: This method do not takes any parameter.
Return Value: This method returns the number of capturing groups in this matcher’s pattern.
Below examples illustrate the MatchResult.groupCount() method:
Example 1:
Java
// Java code to illustrate groupCount() methodimport 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 = " GeeksForGeeks Geeks for For Geeks Geek"; // Create a matcher for the input String MatchResult matcher = pattern .matcher(stringToBeMatched); // Get the number of capturing groups // using groupCount() method System.out.println(matcher.groupCount()); }} |
Output:
1
Example 2:
Java
// Java code to illustrate groupCount() methodimport 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 = "FGF GF FG FGF"; // Create a matcher for the input String MatchResult matcher = pattern .matcher(stringToBeMatched); // Get the number of capturing groups // using groupCount() method System.out.println(matcher.groupCount()); }} |
Output:
0
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/regex/Matcher.html#groupCount–
