The groupCount() method of Matcher Class is used to get the number of capturing groups in this matcher’s pattern.
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 Matcher.groupCount() method:
Example 1:
// Java code to illustrate groupCount() method import 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"; // Create a matcher for the input String Matcher matcher = pattern .matcher(stringToBeMatched); // Get the number of capturing groups // using groupCount() method System.out.println(matcher.groupCount()); }} |
Output:
0
Example 2:
// Java code to illustrate groupCount() method import 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 = "GFGFGFGFGFGFGFGFGFG"; // Create a matcher for the input String Matcher matcher = pattern .matcher(stringToBeMatched); // Get the number of capturing groups // using groupCount() method System.out.println(matcher.groupCount()); }} |
Output:
0
Reference: Oracle Doc
