From a96fee0591de5f3b628503591d1cad9d23d26140 Mon Sep 17 00:00:00 2001
From: Waylan Limberg <waylan.limberg@icloud.com>
Date: Sun, 12 Jun 2016 21:12:10 -0400
Subject: Attribute lists are not permitted to contain newlines. Fixes #482.

---
 markdown/extensions/attr_list.py | 2 +-
 tests/extensions/attr_list.html  | 4 +++-
 tests/extensions/attr_list.txt   | 2 ++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/markdown/extensions/attr_list.py b/markdown/extensions/attr_list.py
index 683bdf8..de39944 100644
--- a/markdown/extensions/attr_list.py
+++ b/markdown/extensions/attr_list.py
@@ -72,7 +72,7 @@ def isheader(elem):
 
 class AttrListTreeprocessor(Treeprocessor):
 
-    BASE_RE = r'\{\:?([^\}]*)\}'
+    BASE_RE = r'\{\:?([^\}\n]*)\}'
     HEADER_RE = re.compile(r'[ ]+%s[ ]*$' % BASE_RE)
     BLOCK_RE = re.compile(r'\n[ ]*%s[ ]*$' % BASE_RE)
     INLINE_RE = re.compile(r'^%s' % BASE_RE)
diff --git a/tests/extensions/attr_list.html b/tests/extensions/attr_list.html
index 2a36dbc..93a862f 100644
--- a/tests/extensions/attr_list.html
+++ b/tests/extensions/attr_list.html
@@ -63,4 +63,6 @@ And a <strong class="nest">nested <a class="linky2" href="http://example.com" ti
 <p>Value without <em>key</em></p>
 <p>No <em>key or value</em></p>
 <p><em>Weirdness</em></p>
-<p><em>More weirdness</em></p>
\ No newline at end of file
+<p><em>More weirdness</em></p>
+<p>Attr_lists do not contain <em>newlines</em>{ foo=bar
+key=value }</p>
\ No newline at end of file
diff --git a/tests/extensions/attr_list.txt b/tests/extensions/attr_list.txt
index c2adbf4..603b611 100644
--- a/tests/extensions/attr_list.txt
+++ b/tests/extensions/attr_list.txt
@@ -88,3 +88,5 @@ No *key or value*{ = }
 
 *More weirdness*{ === }
 
+Attr_lists do not contain *newlines*{ foo=bar
+key=value }
-- 
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