普遍存在的grep命令的简单实现。

import java.io.BufferedReader;

import java.io.FileReader;/** N o w J a v a . c o m - 时代Java 提 供 **/

import java.util.regex.Matcher;

import java.util.regex.Pattern;


public class Main {

  public static void main(String[] argv) throws Exception {

    Pattern pattern = Pattern.compile("test");

    Matcher matcher = pattern.matcher("test");

    String file = "text.txt";

    BufferedReader br = new BufferedReader(new FileReader(file));

    String line;

    while ((line = br.readLine()) != null) {

      matcher.reset(line);