Join table to use as stringsearcher regex

Hello, I have sql query from our db (sql creator) containing records as e.g.

Id; Source, CreationDate

1; WTT Australian Notice 123, 20190312

2; German Notice 12GG3 and VTS, 20190412

3; VMS and Canadian Notice 53T, 20190312

4; Canadian 78UU, 20190312

I want to use a regex stringseracher for the source attribute and assign a value based on the search result.

I have an excel table that contains the regex I want to search for in the db records and the value I want to assign e.g.

Regex; Country

How can I use this table as my regex string?

My output should look like

Id; Source, CreationDate; Country

1; WTT Australian Notice 123, 20190312; AUSTRALIA

2; German Notice 12GG3 and VTS, 20190412; null

3; VMS and Canadian Notice 53T, 20190312; CANADA

4; Canadian 78UU, 20190312; null

Thanks for your help!