Fix omitted language case (#2472)

* Fix omitted language case

Fixes #2471

* Update pattern to account for non-word chars in language

* Add test for non-word boundary

* Fix lint

Author: facelessuser

docs/src/markdown/about/changelog.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 10.11.1
+
+-   **Fix**: SuperFences: Fix regression where an omitted language in conjunction with options in the fenced header
+    can cause a fence to not be parsed.
+
 ## 10.11
 
 -   **NEW**: SuperFences: Allow fenced code to be parsed in the form ` ```lang {.class #id} `.

pymdownx/__meta__.py

@@ -185,5 +185,5 @@ def parse_version(ver, pre=False):
     return Version(major, minor, micro, release, pre, post, dev)
 
 
-__version_info__ = Version(10, 11, 0, "final")
+__version_info__ = Version(10, 11, 1, "final")
 __version__ = __version_info__._get_canonical()

pymdownx/superfences.py

@@ -44,7 +44,7 @@
 RE_NESTED_FENCE_START = re.compile(
     r'''(?x)
     (?P<fence>~{3,}|`{3,})
-    (?:[ \t]*\.?(?P<lang>[\w#.+-]+))?                                           # Language
+    (?:[ \t]*\.?(?P<lang>[\w#.+-]+)(?=[\t ]|$))?                                           # Language
     (?:
         [ \t]*(\{(?P<attrs>[^\n]*)\}) |                                         # Optional attributes or
         (?P<options>

tests/test_extensions/test_superfences.py

@@ -609,6 +609,40 @@ def __init__(self):
             True
         )
 
+    def test_nonword_boundary_language(self):
+        """Test language with non-word boundary."""
+
+        self.check_markdown(
+            """
+            ```c++ hl_lines="1"
+            #include <iostream>
+            ```
+            """,
+            """
+            <div class="highlight"><pre><span></span><code><span class="hll"><span class="cp">#include</span><span class="w"> </span><span class="cpf">&lt;iostream&gt;</span>
+            </span></code></pre></div>
+            """,  # noqa: E501
+            True
+        )
+
+    def test_omitted_language(self):
+        """Test when language is omitted."""
+
+        self.check_markdown(
+            """
+            ```hl_lines="1"
+            some
+            code
+            ```
+            """,
+            """
+            <div class="highlight"><pre><span></span><code><span class="hll">some
+            </span>code
+            </code></pre></div>
+            """,
+            True
+        )
+
 
 class TestSuperFencesClassesIds(util.MdCase):
     """Test classes and ids without attribute lists."""