Hi Fred,
I think I have figured this out... Since you didn't provide sample code in your question, I have googled for "data-url attribute" and found this article on Stack Over follow: "https://stackoverflow.com/questions/18227375/what-are-data-url-and-data-key-attributes-of-a-tag"
Dude there, offers source code of his<a> tag with "data-url" attrib.

When you click on that link it takes you to the source code of the link

I took that code and stage a sample page to demo a solution in PAD for you. Closer look reviles he got <a> tag and <img> tag for which we don't care, right?

I assume what you after in this example is the following:
data-url="https://www.facebook.com/sharer.php?u=http%3A%2F%2Fkoapi.heroku.com%3Fkid%3D1S05t=Caring%20is%20sharing"
data-url="https://twitter.com/share?url=http%3A%2F%2Fkoapi.heroku.com%3Fkid%3D1S05&text=Join%20the%20revolution!"
and so on....
When you look at the render page of this stage sample, it looks like this. Four URL links and email:

So, in PAD I created new flow which look like this

Here I have open that sample page in Firefox... Personally I don't think PAD will care what browser you use...

Next, I did "Extract Data From Page" action

and here is the PAD magic I think you are seeking...
You can't see but I pointed my mouse pointer with the extract tool on the link and the tool first picked up the <img> tag.

But when you move your mouse pointer around that area, eventual you hit that <a> tag. Then just grab that Href. as is..

The URL that was captured is not what you want but that's OK for now! I have then done the same thing to the second URL, then right click, extract the element and get the second Href. A parentally in PAD when you do that twice int he row PAD is going to assume you want them all and will grab them like so..

Next click "Advanced Settings"

and change that attribute to from "Href" to "Data-url" and click Finish...

and there they are....

Notice, it picked up the private URLs as what I think you were after...
and so when I ran my test flow I get it here

At this point If you got a table just wrap that up in the fore each loop just like VJR thought me and you should be good to go...
I hope this helps..
let me know...
Tom