fetches list of go packages

go_packages.go

package main

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

func main() {
	resp, err := http.Get("https://tip.golang.org/pkg/")
	if err != nil {
		fmt.Println(err)
	} else {
		defer resp.Body.Close()
		body, err := ioutil.ReadAll(resp.Body)
		if err != nil {
			fmt.Println(err)
			os.Exit(1)
		}

		fileStr := string(body)
		fmt.Println(fileStr)
		r := regexp.MustCompile("(<td class=\"pkg-name\" style=\"padding-left:.*)\\W+(<a href=)\"(.*)\">(.*)(</a>)")
		matches := r.FindAllStringSubmatch(fileStr, -1)
		for inx := range matches {
			res := matches[inx]
			pkg_link := res[3]
			pkg_name := res[4]
			fmt.Println(pkg_name, ": ", pkg_link)
		}
	}
}