I have defined dynamic field, that contains Country names, dropdown list, labeled: "Country"(snip 001)
- When user send email, inside the body of the message certain country is included, with following string, as example: Country:Sweden
-You can see how filter is constructed(snip 002) ( matched value is looked up in the body of the message, and if there is match, it needs to populating dynamic field(X-OTRS-DynamicFieldCountry))
So far i was able to construct the Regex phrase, using https://regex101.com/ , tied several other options, they don't work. I know i'm close but still can't make it work

Any help or hint is highly appreciated.
Thank you.
Aleksandar