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);      }}