Harness Program

I am going to explain regular expressions using below harness program.

import java.util.regex.*;
import java.io.*;

public class RegExHarness {
    public static void main(String args[]) throws IOException{
        
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        Pattern pattern;
        Matcher matcher;
        
        String regex;
        String text;
              
        System.out.println("Enter Regular Expression");
        regex = br.readLine();
        pattern = Pattern.compile(regex);
        while(true){
            try{
                System.out.println("Enter the string");
                text = br.readLine();
                matcher = pattern.matcher(text);

                while(matcher.find()){
                    System.out.print("I found the text " + matcher.group());
                    System.out.print(" starting at index " + matcher.start());
                    System.out.println(" Ending at index " + matcher.end());
                }
                System.out.println();
            }
            catch(Exception e){
                System.out.println(e);
            }
        }     
    }
}

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