Go read url from file (change target to your desired domain)

goreadurlfromfile.go

package main
import (
    "fmt"
    "regexp"
    "io/ioutil"
    "log"
 "os"
)
func main() {
 argsWithoutProg := os.Args[1]
    content, err := ioutil.ReadFile(argsWithoutProg)
     if err != nil {
          log.Fatal(err)
     }
    
    str1 := string(content)
    re := regexp.MustCompile(`(https:\/\/www\.target\/?)([a-zA-Z0-9\-\.]){1,200}`)
    //fmt.Printf("Pattern: %v\n", re.String()) // print pattern
    //fmt.Println(re.MatchString(str1)) // true
    submatchall := re.FindAllString(str1, -1)
    for _, element := range submatchall {
        fmt.Println(element)
    }
}