How to find 1 domain from a string?

Question

go

I have a string that contains a domain in the format: domen.com I want to find 1 domain from the text (continue searching until the first occurrence). Googled. could you help me?
expecting hgh.ru but getting h.ru

package main

import(
  "fmt"
  "regexp"
)
var re = regexp.MustCompile("[a-zа-я]\\.[a-zа-я]{2,6}")
func main(){
  for _, value := range re.FindAllString("ghh  hgh.ru", -1) {
    fmt.Println(value)
  }
}

Answer 1

search until the first occurrence: FindStringSubmatch FindSubmatch
`
[
a-za-z]+\.[a-za-z]{2,6}` com/library/view/reg... or here myregexp.com/examples.html + add our [a-z]

Answer 2

And what domain zone should be? If there are several, then you need to list them.

Answer 3

<?php
$a    = 'domen.com';
$b = 'Домен site.ru';//сюда вкидываем строку
$c = stripos($b, $a);
if ($c === false) {
    echo ("Домена '$a' нет в строке");
} else {
     echo("Домен '$a' есть в строке");
} 
?>