Fix link patterns inside wrapped Markdown labels

CHANGES.md

@@ -23,6 +23,7 @@
 - [pull #734] Fix empty list items being parsed as nested lists (#167)
 - [pull #735] Fix `smarty-pants` extra converting quotes inside inline HTML tags and comments (#150)
 - [pull #737] Fix XSS from code spans that the span gamut doesn't treat as code spans in safe mode (#726)
+- [pull #747] Fix `link-patterns` extra linking text inside Markdown links and images whose label wraps onto another line
 
 
 ## python-markdown2 2.5.5

lib/markdown2.py

@@ -3841,7 +3841,8 @@ class LinkPatterns(Extra):
     order = (Stage.LINKS,), ()
     options: _link_patterns
 
-    _basic_link_re = re.compile(r'!?\[.*?\]\(.*?\)')
+    # LinkProcessor's 3000-character sentinel includes both label brackets.
+    _basic_link_re = re.compile(r'!?\[(?s:.{0,2998}?)\]\(.*?\)')
 
     def run(self, text: str):
         link_from_hash = {}

test/tm-cases/link_patterns_markdown_syntax.html

@@ -5,3 +5,15 @@
 <p>[Recipe 123]</p>
 
 <p><a href="http://code.activestate.com/recipes/123/">Recipe 123</a></p>
+
+<p><a href="https://example.com/recipe">See
+Recipe 123</a></p>
+
+<p><img src="recipe.png" alt="See
+Recipe 123" /></p>
+
+<p><a href="http://code.activestate.com/recipes/123/">Recipe 123</a> before <a href="https://example.com/other">See
+Recipe 456</a> and <a href="http://code.activestate.com/recipes/789/">Recipe 789</a> after.</p>
+
+<p><a href="https://example.com/nested">Recipe 123 [nested]
+label</a></p>

test/tm-cases/link_patterns_markdown_syntax.text

@@ -4,4 +4,16 @@
 
 [Recipe 123]
 
-Recipe 123
+Recipe 123
+
+[See
+Recipe 123](https://example.com/recipe)
+
+![See
+Recipe 123](recipe.png)
+
+Recipe 123 before [See
+Recipe 456](https://example.com/other) and Recipe 789 after.
+
+[Recipe 123 [nested]
+label](https://example.com/nested)