JAVA正则表达式匹配，替换，查找，切割

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);        
    }
}