Go를 사용하여 웹페이지 콘텐츠를 문자열로 검색하려면 어떻게 해야 합니까?

package main

import (
    "fmt"
    "io/ioutil"
    "log"
    "net/http"
)

func OnPage(link string) string {
    // Establish a connection with the webpage via HTTP GET
    res, err := http.Get(link)
    if err != nil {
        log.Fatal(err)
    }

    // Read the response body, which contains the webpage's content
    content, err := io.ReadAll(res.Body)
    if err != nil {
        log.Fatal(err)
    }

    // Close the response body
    res.Body.Close()

    // Convert the content into a string and return it
    return string(content)
}

func main() {
    // Example usage: retrieve the content of the BBC News UK webpage
    fmt.Println(OnPage("http://www.bbc.co.uk/news/uk-england-38003934"))
}