Get YouTube channel ID from channel URL in Go

main.go

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"regexp"
)

func main() {
	// Check if the command-line argument is provided
	if len(os.Args) < 2 {
		fmt.Println("Please provide a URL to search into.")
		return
	}

	// Get the URL from the command-line argument
	url := os.Args[1]

	// Make an HTTP GET request
	response, err := http.Get(url)
	if err != nil {
		fmt.Println("Error fetching the URL:", err)
		return
	}
	defer response.Body.Close()

	// Read the response body
	body, err := ioutil.ReadAll(response.Body)
	if err != nil {
		fmt.Println("Error reading the response:", err)
		return
	}

	// Convert the body bytes to string
	content := string(body)

	// Regular expression to find the identifier
	re := regexp.MustCompile(`https://www\.youtube\.com/channel/([^\s"]+)`)

	// Find the match in the retrieved content
	match := re.FindStringSubmatch(content)

	if len(match) >= 2 {
		// The first element in the slice will be the whole match, and the second will be the captured group.
		identifier := match[1]
		fmt.Println("Identifier:", identifier)
	} else {
		fmt.Println("No match found")
	}
}