正则表达式将整个字符串替换为http，替换为空

let str = "你的字符串内容";
let regex = /.* /g;
let replacement = "http";
let result = str.replace(regex, replacement);
console.log(result);

import re

str = "你的字符串内容"
regex = r".*"
replacement = "http"
result = re.sub(regex, replacement, str)
print(result)

import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class RegexExample {
    public static void main(String[] args) {
        String str = "你的字符串内容";
        String regex = ".*";
        String replacement = "http";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(str);
        String result = matcher.replaceAll(replacement);
        System.out.println(result);
    }
}