support ftp+rsync in extract_subdomain

Author: ties

src/functions/extract_subdomain.cpp

@@ -29,7 +29,7 @@ namespace duckdb
             Connection con (db);
 
             // Extract the host from the URL
-            std::regex host_regex (R"(^(?:https?:\/\/)?([^\/\?:]+))");
+            std::regex host_regex (R"(^(?:(?:https?|ftp|rsync):\/\/)?([^\/\?:]+))");
             std::smatch host_match;
             if (!std::regex_search (input, host_match, host_regex))
             {

test/sql/extract_subdomain.test

@@ -74,6 +74,16 @@ SELECT extract_subdomain('https://b.a.example.com.ac:443/path');
 ----
 b.a
 
+query I
+SELECT extract_subdomain('rsync://rpki.example.com/path');
+----
+rpki
+
+query I
+SELECT extract_subdomain('ftp://ftp1.example.com/path');
+----
+ftp1
+
 query I
 SELECT extract_subdomain('com.ac');
 ----