JAVA正则表达式及字符串的替换与分解相关知识总结

String result= "12hello567".replaceAll("\\d+"," 你好 ")；
你好hello 你好

public class ReplaceErrorWord {
public static void main(String args[ ]) { 
String str = "登录网站: 222.128.89.253";
Pattern pattern; 
Matcher matcher; 
String regex = "[\\d]{1,3}[.][\\d]{1,3}[.][\\d]{1,3}[.][\\d]{1,3}";
pattern = Pattern.compile(regex);//使用 regex 初试化模式对象 pattern
matcher = pattern.matcher(str);//得到检索 str 的匹配对象 matcher
String IP="";
while(matcher.find()) {
IP= matcher.group();
System.out.print(matcher.start()+"位置出现:");
System.out.println(IP);
} 
System.out.printf("将%s 替换为 202.192.78.56\n",IP);
String result = matcher.replaceAll("202.192.78.56");
System.out.println(result);
}
}

import java.util.Scanner;
public class Xi{
    public static void main(String[] args){
        System.out.println("请输入一行文本:");
        Scanner reader=new Scanner(System.in);
        String str=reader.nextLine();
        String regex = "[\\s\\d\\p{Punct}]";
        String words[]=str.split(regex);
        for(int i = 0;i < words.length;i++){
            int m=i+1;
            System.out.println("单词"+m+";"+words[i]);
        }
    }
}