Issues with MergeIdenticalTickets 5.0.4 (OTRS 4)

[Cassis]

Hello everyone.

So let me introduce my issues.

I am currently working on the MergeIdenticalTickets Add-on (5.0.4), OTRS 4.
My goal is to merge tickets that contain identical URL.

For instance, I want to merge this kind of ticket :
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From : xxxx@gmail.com
Subject : SUPPORT - XXXX
Body : http://myurl.com/categories/1234567.htm
Hello,
I have a problem ...
-------------------------------------------------------

Atm, I can only merge tickets that come from the same sender and the body has to be strictly the same.

The URL that you can see from my exemple always comes first and I want to merge tickets based on that URL.
No matter what comes after this URL.

I would like to merge identical tickets that come from different users but it has to contain the same URL.
Can I do this ? If yes, how ?

Here is my Regex for the URL : [h-t]+[\:][\//]+[w]+[\.][b-o]+[\.][f-r]+[\/][a-z]+[\/][0-9]+[\.][htm]+
Here is my Regex for the sender : [a-zA-Z0-9._%+-]+@[a-zA-Z0-9._%+-]+[\.][a-z]{3}
Here is a screenshot : imgur

Do I have to change some settings in the xml file (or an other file) provided with the add-on ?

Thank you for your help.

Greetings,
Cassis