Response - Request Nested REST API Calls / Groovy Script fetch parameter from URL

Hi, I am new to SOAP UI and Groovy. I am working on a REST API Automation project.

I have a REST API which gives a 'URL' in the response (Response is in XML).

Now this URL received in the response is my next API which i am supposed to hit. (Structure of the project is:

Request 1 ---> Response 1(which is my Request 2)

Request 2 ---> Response 2 (which is my Request 3)

I have used a groovy script to get the XML node which has the URL in the response.

Now the problem is, How do i make next call with this URL? I added another REST test step but it doesn't read the URL.

Another solution to my problem can be to fetch a URL parameter from the response URL-

Can anyone help me in groovy script which can fetch a parameter from the URL?

I have used: def downloadUrl = context.expand('${REST Request - GetConfig#ResponseAsXml#//data[1]/table[1]/row[1]/@url}')

This url is : https://www.google.com/?aaa=111&bbb=222&ccc=33&__dd__=1484088989_b23f248ac6e5d9a9b47475526bb92ee1

How can i fetch _dd_ parameter from the URL?

Replies awaited.. Cheers