package org.lUOSijin.test;    import java.util.regex.Matcher;  import java.util.regex.Pattern;  public class Regex {   public static void main(String[] args) {    Pattern pattern = Pattern.COMpile("b*g");    Matcher matcher = pattern.matcher("bbg");    System.out.PRintln(matcher.matches());    System.out.println(pattern.matches("b*g","bbg"));    //验证邮政编码    System.out.println(pattern.matches("[0-9]{6}", "200038"));    System.out.println(pattern.matches("//d{6}", "200038"));    //验证电话号码    System.out.println(pattern.matches("[0-9]{3,4}//-?[0-9]+", "02178989799"));    getDate("Nov 10,2009");    charReplace();    //验证身份证:判断一个字符串是不是身份证号码，即是否是15或18位数字。    System.out.println(pattern.matches("^//d{15}|//d{18}$", "123456789009876"));    getString("D:/dir1/test.txt");    getChinese("welcome to china,江西奉新,welcome,你!");    validateEmail("luosijin123@163.com");   }   /**    * 日期提取:提取出月份来    */   public static void getDate(String str){    String regEx="([a-zA-Z]+)|//s+[0-9]{1,2},//s*[0-9]{4}";    Pattern pattern = Pattern.compile(regEx);    Matcher matcher = pattern.matcher(str);    if(!matcher.find()){     System.out.println("日期格式错误!");     return;    }    System.out.println(matcher.group(1)); //分组的索引值是从1开始的，所以取第一个分组的方法是m.group(1)而不是m.group(0)。   }   /**    * 字符替换:本实例为将一个字符串中所有包含一个或多个连续的“a”的地方都替换成“A”。    */   public static void charReplace(){    String regex = "a+";    Pattern pattern = Pattern.compile(regex);    Matcher matcher = pattern.matcher("okaaaa LetmeAseeaaa aa booa");    String s = matcher.replaceAll("A");    System.out.println(s);   }   /**    * 字符串提取    */   public static void getString(String str){    String regex = ".+/(.+)$";    Pattern pattern = Pattern.compile(regex);    Matcher matcher = pattern.matcher(str);    if(!matcher.find()){     System.out.println("文件路径格式不正确！");     return;    }    System.out.println(matcher.group(1));   }   /**    * 中文提取    * @param str    * @author 罗嗣金    * @date 2009-11-10 上午12:27:17    */   public static void getChinese(String str){    String regex = "[//u4E00-//u9FFF]+";//[//u4E00-//u9FFF]为汉字    Pattern pattern = Pattern.compile(regex);    Matcher matcher = pattern.matcher(str);    StringBuffer sb = new StringBuffer();    while(matcher.find()){     sb.append(matcher.group());    }    System.out.println(sb);   }    public static void validateEmail(String email){    String regex = "[0-9a-zA-Z]+@[0-9a-zA-Z]+//.[0-9a-zA-Z]+";    Pattern pattern = Pattern.compile(regex);    Matcher matcher = pattern.matcher(email);    if(matcher.matches()){     System.out.println("这是合法的Email");    }else{     System.out.println("这是非法的Email");    }   }  }