Search code examples
elixir

How to validate url in elixir?

I want to validate uris like:

http://vk.com
http://semantic-ui.com/collections/menu.html
https://translate.yandex.ru/?text=poll&lang=en-ru

and not

www.vk.com
abdeeej
http://vk

but haven't found either package of native code implementation for it.

How can I do that?

Solution

  • All of those are technically valid URLs according to the spec so URI.parse/1 returns a %URI{} struct for all, but if you want to reject domains without a scheme and a dot in the host, you can do:

    valid? = fn url ->
  uri = URI.parse(url)
  uri.scheme != nil && uri.host =~ "."
end

    Test:

    urls = [
  "http://vk.com",
  "http://semantic-ui.com/collections/menu.html",
  "https://translate.yandex.ru/?text=poll&lang=en-ru",
  "www.vk.com",
  "abdeeej",
  "http://vk"
]

urls |> Enum.map(valid?) |> IO.inspect

    Output:

    [true, true, true, false, false, false]