Java正則表達式使用

復制代碼 代碼如下:

[\w[.-]]+@[\w[.-]]+\.[\w]+

  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;//正常代碼行    static long commentLines = 0;//注釋行    static long whiteLines = 0;//空白行    public static void main(String[] args) {      //找到某個文件夾,該文件夾下面在沒有文件夾，這里沒有寫遞歸處理不在同一文件夾的文件      File f = new File("E:\Workspaces\eclipse\Application\JavaMailTest\src\com\java\mail");      File[] codeFiles = f.listFiles();      for(File child : codeFiles){        //只統計java文件        if(child.getName().matches(".*\.java$")) {          parse(child);        }      }      System.out.println("normalLines:" + normalLines);      System.out.println("commentLines:" + commentLines);      System.out.println("whiteLines:" + whiteLines);    }    private static void parse(File f) {      BufferedReader br = null;      //表示是否為注釋開始      boolean comment = false;      try {        br = new BufferedReader(new FileReader(f));        String line = "";        while((line = br.readLine()) != null) {          //去掉注釋符/*前面可能出現的空白          line = line.trim();          //空行 因為readLine()將字符串取出來時，已經去掉了換行符n          //所以不是"^[\s&&[^\n]]*\n$"          if(line.matches("^[\s&&[^\n]]*$")) {            whiteLines ++;          } else if (line.startsWith("/*") && !line.endsWith("*/")) {            //統計多行/*****/            commentLines ++;            comment = true;            } else if (line.startsWith("/*") && line.endsWith("*/")) {            //統計一行/**/            commentLines ++;          } else if (true == comment) {            //統計*/            commentLines ++;            if(line.endsWith("*/")) {              comment = false;            }          } else if (line.startsWith("http://")) {            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();          }        }      }    }  }