Re-use compiled regex for block level checks

Author: HebaruSan

docs/change_log/index.md

@@ -7,6 +7,7 @@ Under development: version 3.3.5 (a bug-fix release).
 
 * Make the `slugify_unicode` function not remove diacritical marks (#1118).
 * Fix `[toc]` detection when used with `nl2br` extension (#1160)
+* Re-use compiled regex for block level checks (#1169)
 
 Feb 24, 2021: version 3.3.4 (a bug-fix release).
 

markdown/postprocessors.py

@@ -65,6 +65,8 @@ def run(self, text):
 class RawHtmlPostprocessor(Postprocessor):
     """ Restore raw html to the document. """
 
+    BLOCK_LEVEL_REGEX = re.compile(r'^\<\/?([^ >]+)')
+
     def run(self, text):
         """ Iterate over html stash and restore html. """
         replacements = OrderedDict()
@@ -99,7 +101,7 @@ def substitute_match(m):
             return self.run(processed_text)
 
     def isblocklevel(self, html):
-        m = re.match(r'^\<\/?([^ >]+)', html)
+        m = self.BLOCK_LEVEL_REGEX.match(html)
         if m:
             if m.group(1)[0] in ('!', '?', '@', '%'):
                 # Comment, php etc...