Java正则表达式使用

import java.io.BufferedReader;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;import java.util.regex.Matcher;import java.util.regex.Pattern;public class EmailSpider {  public static void main(String[] args) {    try {      BufferedReader br = new BufferedReader(new FileReader("C://emailSpider.html"));      String line = "";      while((line=br.readLine()) != null) {        parse(line);      }    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    }  }  private static void parse(String line) {    Pattern p = Pattern.compile("[//w[.-]]+@[//w[.-]]+//.[//w]+");    Matcher m = p.matcher(line);    while(m.find()) {      System.out.println(m.group());    }  }}

import java.io.BufferedReader;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;public class CodeCounter {  static long normalLines = 0;//正常代码行  static long commentLines = 0;//注释行  static long whiteLines = 0;//空白行  public static void main(String[] args) {    //找到某个文件夹,该文件夹下面在没有文件夹，这里没有写递归处理不在同一文件夹的文件    File f = new File("E://Workspaces//eclipse//Application//JavaMailTest//src//com//java//mail");    File[] codeFiles = f.listFiles();    for(File child : codeFiles){      //只统计java文件      if(child.getName().matches(".*//.java$")) {        parse(child);      }    }    System.out.println("normalLines:" + normalLines);    System.out.println("commentLines:" + commentLines);    System.out.println("whiteLines:" + whiteLines);  }  private static void parse(File f) {    BufferedReader br = null;    //表示是否为注释开始    boolean comment = false;    try {      br = new BufferedReader(new FileReader(f));      String line = "";      while((line = br.readLine()) != null) {        //去掉注释符/*前面可能出现的空白        line = line.trim();        //空行 因为readLine()将字符串取出来时，已经去掉了换行符/n        //所以不是"^[//s&&[^//n]]*//n$"        if(line.matches("^[//s&&[^//n]]*$")) {          whiteLines ++;        } else if (line.startsWith("/*") && !line.endsWith("*/")) {          //统计多行/*****/          commentLines ++;          comment = true;          } else if (line.startsWith("/*") && line.endsWith("*/")) {          //统计一行/**/          commentLines ++;        } else if (true == comment) {          //统计*/          commentLines ++;          if(line.endsWith("*/")) {            comment = false;          }        } else if (line.startsWith("//")) {          commentLines ++;        } else {          normalLines ++;        }      }    } catch (FileNotFoundException e) {      e.printStackTrace();    } catch (IOException e) {      e.printStackTrace();    } finally {      if(br != null) {        try {          br.close();          br = null;        } catch (IOException e) {          e.printStackTrace();        }      }    }  }}