Fix HR which follows strong em.

Fixes #897.

Author: waylan

docs/change_log/release-3.3.md

@@ -70,6 +70,7 @@ The following new features have been included in the 3.3 release:
 
 The following bug fixes are included in the 3.3 release:
 
+* Fix HR which follows strong em (#897).
 * Support short reference image links (#894).
 * Avoid a `RecursionError` from deeply nested blockquotes (#799).
 * Fix issues with complex emphasis (#979).

markdown/blockprocessors.py

@@ -495,7 +495,7 @@ def run(self, parent, blocks):
 class HRProcessor(BlockProcessor):
  """ Process Horizontal Rules. """
 
- RE = r'^[ ]{0,3}((-+[ ]{0,2}){3,}|(_+[ ]{0,2}){3,}|(\*+[ ]{0,2}){3,})[ ]*'
+ RE = r'^[ ]{0,3}((-+[ ]{0,2}){3,}|(_+[ ]{0,2}){3,}|(\*+[ ]{0,2}){3,})[ ]*$'
  # Detect hr on any line of a block.
  SEARCH_RE = re.compile(RE, re.MULTILINE)
 

tests/test_syntax/blocks/test_hr.py

@@ -308,6 +308,22 @@ def test_hr_after_paragraph(self):
  )
  )
 
+ def test_hr_after_emstrong(self):
+ self.assertMarkdownRenders(
+ self.dedent(
+ """
+ ***text***
+ ***
+ """
+ ),
+ self.dedent(
+ """
+ <p><strong><em>text</em></strong></p>
+ <hr />
+ """
+ )
+ )
+
  def test_not_hr_2_asterisks(self):
  self.assertMarkdownRenders(
  '**',