Count unique lines on a long text field

[Jorge_Gonzalez]

I have some entries that have a long text field for example

example.com
example2.com

HugeDomains

Example3.com is for sale | HugeDomains

Since 2005, we have helped thousands of people get the perfect domain name.

example2.com

Is there a way to show the total unique urls?

I have this formula

ABS(IF(LEN(SUBSTITUTE(TRIM({URL/Video Match URL}),"\n","")) > 1, LEN(SUBSTITUTE(TRIM({URL/Video Match URL}),"\n","")) - 1 , LEN(SUBSTITUTE(TRIM({URL/Video Match URL}),"\n",""))) - LEN(TRIM({URL/Video Match URL})))

But this formula only counts the total of the lines/urls. I wish to only count the unique urls.
The name of the field is: URL/Video Match URL