学习Java正则表达式（匹配、替换、查找）

import java.util.ArrayList;import java.util.regex.Matcher;import java.util.regex.Pattern;public class test { public static void main(String[] args) {  getStrings(); //用正则表达式获取指定字符串内容中的指定内容  System.out.println("********************");  replace(); //用正则表达式替换字符串内容  System.out.println("********************");  strSplit(); //使用正则表达式切割字符串  System.out.println("********************");  strMatch(); //字符串匹配 } private static void strMatch() {  String phone = "13539770000";  //检查phone是否是合格的手机号(标准:1开头，第二位为3,5,8，后9位为任意数字)  System.out.println(phone + ":" + phone.matches("1[358][0-9]{9,9}")); //true     String str = "abcd12345efghijklmn";  //检查str中间是否包含12345  System.out.println(str + ":" + str.matches("//w+12345//w+")); //true  System.out.println(str + ":" + str.matches("//w+123456//w+")); //false } private static void strSplit() {  String str = "asfasf.sdfsaf.sdfsdfas.asdfasfdasfd.wrqwrwqer.asfsafasf.safgfdgdsg";  String[] strs = str.split("//.");  for (String s : strs){   System.out.println(s);  }   } private static void getStrings() {  String str = "rrwerqq84461376qqasfdasdfrrwerqq84461377qqasfdasdaa654645aafrrwerqq84461378qqasfdaa654646aaasdfrrwerqq84461379qqasfdasdfrrwerqq84461376qqasfdasdf";  Pattern p = Pattern.compile("qq(.*?)qq");  Matcher m = p.matcher(str);  ArrayList<String> strs = new ArrayList<String>();  while (m.find()) {   strs.add(m.group(1));     }   for (String s : strs){   System.out.println(s);  }   } private static void replace() {  String str = "asfas5fsaf5s4fs6af.sdaf.asf.wqre.qwr.fdsf.asf.asf.asf";  //将字符串中的.替换成_，因为.是特殊字符，所以要用/.表达，又因为/是特殊字符，所以要用//.来表达.  str = str.replaceAll("//.", "_");  System.out.println(str);   }}