diff --git a/rendercv/cli/printer.py b/rendercv/cli/printer.py
index bf92f4bc..525b5df2 100644
--- a/rendercv/cli/printer.py
+++ b/rendercv/cli/printer.py
@@ -226,6 +226,10 @@ def print_validation_errors(exception: pydantic.ValidationError):
             "This is not a valid date! Please use either YYYY-MM-DD, YYYY-MM, or YYYY"
             " format!"
         ),
+        "String should match pattern '\\b10\\..*'": (
+            'A DOI prefix should always start with "10.". For example,'
+            ' "10.1109/TASC.2023.3340648".'
+        ),
         "URL scheme should be 'http' or 'https'": "This is not a valid URL!",
         "Field required": "This field is required!",
         "value is not a valid phone number": "This is not a valid phone number!",
diff --git a/rendercv/data/models/computers.py b/rendercv/data/models/computers.py
index 70415021..490218dd 100644
--- a/rendercv/data/models/computers.py
+++ b/rendercv/data/models/computers.py
@@ -233,7 +233,7 @@ def make_a_url_clean(url: str) -> str:
     Returns:
         str: The clean URL.
     """
-    url = url.replace("https://", "").replace("http://", "").replace("www.", "")
+    url = url.replace("https://", "").replace("http://", "")
     if url.endswith("/"):
         url = url[:-1]
 
diff --git a/rendercv/data/models/entry_types.py b/rendercv/data/models/entry_types.py
index 711a01c3..b9594a58 100644
--- a/rendercv/data/models/entry_types.py
+++ b/rendercv/data/models/entry_types.py
@@ -229,7 +229,7 @@ class PublicationEntryBase(RenderCVBaseModelWithExtraKeys):
         title="Authors",
         description="The authors of the publication in order as a list of strings.",
     )
-    doi: Optional[str] = pydantic.Field(
+    doi: Optional[Annotated[str, pydantic.Field(pattern=r"\b10\..*")]] = pydantic.Field(
         default=None,
         title="DOI",
         description="The DOI of the publication.",
@@ -252,8 +252,8 @@ class PublicationEntryBase(RenderCVBaseModelWithExtraKeys):
     def ignore_url_if_doi_is_given(self) -> "PublicationEntryBase":
         """Check if DOI is provided and ignore the URL if it is provided."""
         doi_is_provided = self.doi is not None
-        url_is_provided = self.url is not None
-        if doi_is_provided and url_is_provided:
+
+        if doi_is_provided:
             self.url = None
 
         return self
@@ -278,7 +278,7 @@ class PublicationEntryBase(RenderCVBaseModelWithExtraKeys):
         url_is_provided = self.url is not None
 
         if url_is_provided:
-            return computers.make_a_url_clean(self.url)  # type: ignore
+            return computers.make_a_url_clean(str(self.url))  # type: ignore
         else:
             return ""
 
diff --git a/tests/test_data.py b/tests/test_data.py
index 0ffa0edb..e22fd96a 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -767,3 +767,21 @@ def test_dictionary_key_to_proper_section_title(key, expected_section_title):
 
 
 # def test_if_available_themes_and_avaialble_theme_options_has_the_same_length():
+
+
+@pytest.mark.parametrize(
+    "url, expected_clean_url",
+    [
+        ("https://example.com", "example.com"),
+        ("https://example.com/", "example.com"),
+        ("https://example.com/test", "example.com/test"),
+        ("https://example.com/test/", "example.com/test"),
+        ("https://www.example.com/test/", "www.example.com/test"),
+    ],
+)
+def test_make_a_url_clean(url, expected_clean_url):
+    assert computers.make_a_url_clean(url) == expected_clean_url
+    assert (
+        data.PublicationEntry(title="Test", authors=["test"], url=url).clean_url
+        == expected_clean_url
+    )