Regex needed to match a domain name for django view

Question 1

Fortunately, this wasn't that bad after all - this is one way to match a domain with varying extensions:

^[A-za-z]{2,50}.[a-z]{1,3}$

matches .com, .org, .net, etc.

If you have a domain like me2.com, its better to use this:

(^[A-za-z0-9]{2,50}.[a-z]{1,3})$

Question 2

you can use this

/^(?:http(?:s)?:\/\/)?(?:w{3})\.([a-z_0-9-]+\.\w{2,3}(?:\.\w{2})?)/i

it will match for links likes this

and alot of other variations

even if the site has
www.site.com/news

it will only match for "site.com"

the /i modifier will match for all variations of upper and lower cases

if you only want to match domain name as upper and lower

/^(?:http(?:s)?:\/\/)?(?:w{3})\.((?i:[a-z_0-9-])+\.\w{2,3}(?:\.\w{2})?)/

(?i:[a-z_0-9-]) will match variations for domain's names only