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);
}
}