Correct regex for metadata 'name' format

source/specifications/dependency-specifiers.rst

@@ -142,7 +142,7 @@ document we limit the acceptable values for identifiers to that regex. A full
 redefinition of name may take place in a future metadata PEP. The regex (run
 with re.IGNORECASE) is::
 
-    ^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])$
+    ^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])\Z
 
 .. _dependency-specifiers-extras:
 
@@ -526,6 +526,9 @@ History
   in use since late 2022.
 - April 2025: Added ``extras`` and ``dependency_groups`` for
   :ref:`lock-file-spec` as approved through :pep:`751`.
+- August 2025: The suggested name validation regex was fixed to match the field
+  specification (it previously finished with ``$`` instead of ``\Z``,
+  incorrectly permitting trailing newlines)
 
 
 References

source/specifications/name-normalization.rst

@@ -17,7 +17,7 @@ underscore and hyphen. It must start and end with a letter or number.
 This means that valid project names are limited to those which match the
 following regex (run with :py:data:`re.IGNORECASE`)::
 
-    ^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])$
+    ^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])\Z
 
 
 .. _name-normalization:
@@ -53,3 +53,6 @@ History
   :pep:`503 <503#normalized-names>`.
 - November 2015: The specification of valid names was approved through
   :pep:`508 <508#names>`.
+- August 2025: The suggested name validation regex was fixed to match the field
+  specification (it previously finished with ``$`` instead of ``\Z``,
+  incorrectly permitting trailing newlines)