如何使用正则表达式删除文件开头的文本？

import re

# 读取文件内容
with open('file.txt', 'r') as file:
    content = file.read()

# 使用正则表达式删除开头的文本
content = re.sub(r'^.*?\n', '', content)

# 将修改后的内容写回文件
with open('file.txt', 'w') as file:
    file.write(content)

const fs = require('fs');
const path = require('path');
const { promisify } = require('util');
const readFileAsync = promisify(fs.readFile);
const writeFileAsync = promisify(fs.writeFile);

const filePath = path.join(__dirname, 'file.txt');

async function removeStartingText() {
  try {
    const content = await readFileAsync(filePath, 'utf8');
    const updatedContent = content.replace(/^.*?\n/, '');
    await writeFileAsync(filePath, updatedContent);
  } catch (error) {
    console.error(error);
  }
}

removeStartingText();

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] args) {
        try {
            String content = new String(Files.readAllBytes(Paths.get("file.txt")));
            Pattern pattern = Pattern.compile("^.*?\n");
            Matcher matcher = pattern.matcher(content);
            String updatedContent = matcher.replaceFirst("");
            Files.write(Paths.get("file.txt"), updatedContent.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}