1 files changed, 30 insertions, 0 deletions
diff --git a/markdown/extensions/legacy_em.py b/markdown/extensions/legacy_em.py
new file mode 100644
index 0000000..5cc0f6d
--- /dev/null
+++ b/markdown/extensions/legacy_em.py
@@ -0,0 +1,30 @@
+'''
+Legacy Em Extension for Python-Markdown
+=======================================
+
+This extention provides legacy behavior for _connected_words_.
+
+Copyright 2015-2018 The Python Markdown Project
+
+License: [BSD](http://www.opensource.org/licenses/bsd-license.php)
+
+'''
+
+from __future__ import absolute_import
+from __future__ import unicode_literals
+from . import Extension
+from ..inlinepatterns import SimpleTagInlineProcessor
+
+EMPHASIS_RE = r'(\*|_)(.+?)\1'
+STRONG_RE = r'(\*{2}|_{2})(.+?)\1'
+
+
+class LegacyEmExtension(Extension):
+    """ Add legacy_em extension to Markdown class."""
+
+    def extendMarkdown(self, md, md_globals):
+        """ Modify inline patterns. """
+        md.inlinePatterns.register(SimpleTagInlineProcessor(STRONG_RE, 'strong'), 'strong', 40)
+        md.inlinePatterns.register(SimpleTagInlineProcessor(EMPHASIS_RE, 'em'), 'emphasis', 30)
+        md.inlinePatterns.deregister('strong2')
+        md.inlinePatterns.deregister('emphasis2')