/**
 * @Author 陈杨
 * @Date 2022/9/8 17:29
 * @注释
 */
import java.util.*;
import java.util.regex.*;

public class Pattern {
    public static void main(String[] args) {
//        System.out.println(Arrays.toString(args));
        if(args.length<2) return;
        for(String arg:args){
            System.out.println("message is "+args[0]);
            System.out.println("pattern is "+arg);
            java.util.regex.Pattern p=java.util.regex.Pattern.compile(arg);
            Matcher matcher=p.matcher(args[0]);
            while(matcher.find()){
                System.out.println("find "+matcher.group()+" at "+matcher.start()+"-"+matcher.end());
            }




        }
    }
}

/**
 * @Author 陈杨
 * @Date 2022/9/8 16:04
 * @注释
 */
import java.util.regex.Pattern;
public class IntegerMatch {
    public static void main(String[] args) {
        System.out.println("1234".matches("-?\\d+"));
        System.out.println("-1234".matches("-?\\d+"));
        System.out.println("+1234".matches("-?\\d+"));
        System.out.println("+1234".matches("(-?|\\+?)\\d+"));
    }
}

import java.util.Arrays;

/**
 * @Author 陈杨
 * @Date 2022/9/8 16:38
 * @注释
 */
public class Splitting {
    public static String knight="then, when you find the tree"
            +"you must kill the tree"
            +"whith midest ... sb skill";
    public static void split(String regex){
        System.out.println(Arrays.toString(knight.split(regex)));
    }

    public static void main(String[] args) {
        split(" ");
        split("n\\W+");
        split("\\W+");
        System.out.println((knight.replaceFirst("f\\w+","located")));
        System.out.println((knight.replaceAll("\\w+","located")));
    }
}

查看正则表达式使用Pattern (Java SE 15 & JDK 15)

查看java思想的课后习题查看thinking_in_java_answer/Replacing9.java at master · kinggggg/thinking_in_java_answer · GitHub