Fix failing test cases

lib/markdown2.py

@@ -803,7 +803,7 @@ def _hash_html_block_sub(self, match, raw=False):
                 # if MD is on same line as opening tag then split across two lines
                 lines = list(filter(None, (re.split(r'(.*?<%s.*markdown=.*?>)' % tag, lines[0])))) + lines[1:]
                 # if MD on same line as closing tag, split across two lines
-                lines = lines[:-1] + list(filter(None, re.split(r'(.*?</%s>.*?$)' % tag, lines[-1])))
+                lines = lines[:-1] + list(filter(None, re.split(r'(\s*?</%s>.*?$)' % tag, lines[-1])))
                 # extract key sections of the match
                 first_line = lines[0]
                 middle = '\n'.join(lines[1:-1])