Python: Support structured MIME subtypes in data URIs

python/semantic_kernel/contents/utils/data_uri.py

@@ -135,7 +135,7 @@ def from_data_uri(cls: type[_T], data_uri: str | Url, default_mime_type: str = "
         if not data or "," not in data:
             raise ContentInitializationError("Invalid data uri format. The data is missing.")
 
-        pattern = "(((?P<mime_type>[a-zA-Z]+/[a-zA-Z-]+)(?P<parameters>(;[a-zA-Z0-9]+=+[a-zA-Z0-9]+)*))?(;+(?P<data_format>.*)))?(,(?P<data_str>.*))"  # noqa: E501
+        pattern = "(((?P<mime_type>[a-zA-Z]+/[a-zA-Z0-9!#$&^_.+-]+)(?P<parameters>(;[a-zA-Z0-9]+=+[a-zA-Z0-9]+)*))?(;+(?P<data_format>.*)))?(,(?P<data_str>.*))"  # noqa: E501
         match = re.match(pattern, data)
         if not match:
             raise ContentInitializationError("Invalid data uri format.")

python/tests/unit/contents/test_data_uri.py

@@ -39,6 +39,24 @@
             "base64",
             id="basic_binary",
         ),
+        pytest.param(
+            "data:image/svg+xml;base64,PHN2Zy8+",
+            b"<svg/>",
+            "PHN2Zy8+",
+            "image/svg+xml",
+            {},
+            "base64",
+            id="structured_suffix",
+        ),
+        pytest.param(
+            "data:application/vnd.api+json;base64,e30=",
+            b"{}",
+            "e30=",
+            "application/vnd.api+json",
+            {},
+            "base64",
+            id="vendor_subtype",
+        ),
         pytest.param(
             "data:text/plain;base64,U29t\r\nZQ==\t",
             b"Some",