matchs() method in Java and examples

java.util.regex.Matcher class represents an engine for executing various matching operations. This class does not have a constructor, and it can be used withmatches()method of java.util.regex.Pattern class creates/Get the object of this class.

This kind ofmatches()The method matches a string with a pattern represented by a regular expression (all given at object creation). In the case of a match, this method returns true, otherwise it returns false. For this method to return the correct result, the entire region should have a match.

Example

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MatchesExample {
　　　public static void main(String args[]) {
　　　　　　//Read a string from the user
　　　　　　System.out.println("Enter a String");
　　　　　　Scanner sc = new Scanner(System.in);
　　　　　　String input = sc.next();
　　　　　　//Regular expression to match words starting with a digit
　　　　　　String regex = "^[0-9].*$";
　　　　　　//Compile the regular expression
　　　　　　Pattern pattern = Pattern.compile(regex);
　　　　　　//Retrieve the matcher object
　　　　　　Matcher matcher = pattern.matcher(input);
　　　　　　//Verify if a match occurs
　　　　　　boolean bool = matcher.matches();
　　　　　　if(bool) {
　　　　　　　　　System.out.println("The first character is a digit");
　　　　　　} else {
　　　　　　　　　System.out.println("The first character is not a digit");
　　　　　　}
　　　}
}

Output Result

Enter a String
4hiipla
The first character is a digit