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Matcher groupCount() method in Java with Examples
The java.util.regex.Matcher class represents an engine that performs various match operations. There is no constructor for this class, you can create/obtain an object of this class using the matches() method of the class java.util.regex.Pattern.
The groupCount() method of this (Matcher) class calculates the number of capturing groups in the current match.
Example 1
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class GroupTest {
public static void main(String[] args) {
String regex = "(.*)(\d+)(.*)";
String input = "This is a sample Text, 1234, with numbers in between.";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(input);
if(matcher.find()) {
System.out.println("First group match: "+matcher.group(1));
System.out.println("Second group match: "+matcher.group(2));
System.out.println("Third group match: "+matcher.group(3));
System.out.println("Number of groups capturing: "+matcher.groupCount());
}
}
}Output
First group match: This is a sample Text, 123 Second group match: 4 Third group match: , with numbers in between. Number of groups: 3
Example 2
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Test {
public static void main(String[] args) {
String str1 = "<p>This <b>is</b> an <b>example</b>HTML <b>script</b> where <b>ever</b> alternative <b>word</b> is <b>bold</b></p>.";
//Regular expression to match contents of the bold tags
String regex = "(t(\S+)t)(\s)";
String str = "the words tit tat tweet tostff tact that tilt text start and end wit the letter t ";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(str);
while (matcher.find()) {
System.out.println(matcher.group(0));
}
System.out.println("Total capturing groups: "+matcher.groupCount());
}
}Output
tit tat tweet tact that tilt text tart Total capturing groups: 3
Updated on: 20-Nov-2019
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