youtubeのhtmlで動画URLを抽出する

main.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"strings"

	"github.com/PuerkitoBio/goquery"
)

func main() {
	fileInfos, _ := ioutil.ReadFile("./youtube.html")
	stringReader := strings.NewReader(string(fileInfos))
	doc, err := goquery.NewDocumentFromReader(stringReader)
	if err != nil {
		panic(err)
	}
	w, _ := os.OpenFile("result.txt", os.O_WRONLY|os.O_CREATE, 0644)
	doc.Find("a").Each(func(_ int, s *goquery.Selection) {
		url, _ := s.Attr("href")
		if strings.Contains(url, "watch?v=") {
			fmt.Println(url)
			w.WriteString(url + "\n")
		}
	})
}