Grep.java Source code

Introduction

Here is the source code for Grep.java

Source

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Grep {

    public static void main(String args[]) throws Exception {
        String regex = "";
        InputStream in = System.in;

        regex = args[0];
        in = new BufferedInputStream(new FileInputStream(args[1]));
        Pattern p = null;

        p = Pattern.compile(regex);

        BufferedReader buff = new BufferedReader(new InputStreamReader(in));

        String a;
        for (a = buff.readLine(); a != null; a = buff.readLine()) {
            Matcher m = p.matcher(a);
            if (m.find()) {
                System.out.println(a);
            }
        }
    }
}