import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
 
public class RegexGetMathod { 
 
  public static void main(String[] args) { 
    String str = "ming tian jiu yao fang jia le ,da jia。"; 
    getSub(str, "\\b[a-z]{3}\\b"); 
 
  } 
  //獲取子串 
  public static void getSub(String str, String regex){ 
    //將規(guī)則封裝成對(duì)象 
    Pattern p = Pattern.compile(regex); 
    //讓正則對(duì)象和要作用的字符集相關(guān)聯(lián)，獲取匹配器對(duì)象 
    Matcher m = p.matcher(str); 
    //boolean b = m.find()；//將規(guī)則作用到字符串上，并進(jìn)行符合規(guī)則的子串查找 
    //m.group()；//用于獲取匹配后結(jié)果 
    while(m.find()){ 
      System.out.print(m.group()); 
      System.out.println("-->位置為：" + m.start() + "---" + m.end()); 
    } 
     
  } 
 
}

public static void replaceStr() 
  { 
    String str = "我我...我我...我要..要要...要要...學(xué)學(xué)學(xué)....學(xué)學(xué)...編編編...編程..程.程程...程...程"; 
    /* 
    將已有字符串變成另一個(gè)字符串。使用 替換功能。 
    1,可以先將 . 去掉。 
    2，在將多個(gè)重復(fù)的內(nèi)容變成單個(gè)內(nèi)容。 
    */ 
     
    str = str.replaceAll("\\.+", ""); 
    System.out.println(str); 
     
    str = str.replaceAll("(.)\\1+", "$1"); 
    System.out.println(str); 
 
  }

public static void ipSort() 
  { 
    String ip = "192.68.1.254 102.49.23.013 10.10.10.10 2.2.2.2 8.109.90.30"; 
    ip = ip.replaceAll("(\\d+)", "00$1"); 
    System.out.println(ip); 
     
    ip = ip.replaceAll("0*(\\d{3})", "$1"); 
    System.out.println(ip); 
    String[] strs = ip.split(" "); 
    Arrays.sort(strs); 
    for(String str : strs){ 
      str = str.replaceAll("0*(\\d+)", "$1"); 
      System.out.println(str); 
    } 
  }

public static void checkMail() 
  { 
    String mail = "abc12@sina.com"; 
    //mail = "1@1.1"; 
     
    String reg = "[a-zA-Z_0-9]+@[a-zA-Z0-9]+(\\.[a-zA-Z]+){1,2}";//較為精確的匹配。 
    //reg = "\\w+@\\w+(\\.\\w+){1,2}";//相對(duì)不太精確的匹配。 
    //mail.indexOf("@")!=-1 
     
    System.out.println(mail.matches(reg)); 
  }

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 
import java.util.regex.Matcher; 
import java.util.regex.Pattern; 
 
public class RegexTest1 { 
 
  /** 
   * @網(wǎng)絡(luò)爬蟲 
   * 
   */ 
  public static void main(String[] args) { 
    crawler("file:///C:/Documents%20and%20Settings/Administrator/%E6%A1%8C%E9%9D%A2/%E9%82%AE%E4%BB%B6.htm"); 
 
  } 
   
  //網(wǎng)頁爬蟲功能，獲取指定網(wǎng)址的郵箱 
  public static void crawler(String urlPath){ 
    URL ul = null; 
    BufferedReader br = null; 
    //建立連接 
    try { 
      ul = new URL(urlPath); 
    } catch (MalformedURLException e) { 
      throw new RuntimeException("指定地址未找到"); 
    } 
    URLConnection conn; 
    try { 
      conn = ul.openConnection(); 
      br = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
    } catch (IOException e1) { 
      throw new RuntimeException("連接失敗"); 
    } 
    //匹配指定的內(nèi)容 
    Pattern p = Pattern.compile("\\w+@\\w+(\\.\\w){1,2}"); 
    String line = null; 
    try { 
      while((line=br.readLine())!=null){ 
        Matcher m = p.matcher(line); 
        while(m.find()) 
          System.out.println(m.group()); 
      } 
    } catch (IOException e) { 
      throw new RuntimeException("讀取數(shù)據(jù)失敗"); 
    } 
  } 
 
}