InvalidLinkBear: Disallow backslashes in URLs

There's no valid usecase for those, only false positives.

Related: #691

Author: sils

bears/general/InvalidLinkBear.py

@@ -42,8 +42,8 @@ def get_status_code(url, timeout):
     def find_links_in_file(file, timeout, ignore_regex):
         ignore_regex = re.compile(ignore_regex)
         regex = re.compile(
-            r'((ftp|http)s?://[^.:\s_/?#[\]@]+\.(?:[^\s()\'\"<>|]+|'
-            r'\([^\s()]*\))*)(?<!\.)(?<!,)')
+            r'((ftp|http)s?://[^.:\s_/?#[\]@\\]+\.(?:[^\s()\'"<>|\\]+|'
+            r'\([^\s()\'"<>|\\]*\))*)(?<!\.)(?<!,)')
         for line_number, line in enumerate(file):
             match = regex.search(line)
             if match:

tests/general/InvalidLinkBearTest.py

@@ -90,6 +90,7 @@ def test_run(self):
         [httpbin](http://httpbin.org/status/200)
         |http://httpbin.org/status/200|
         <h3>Something http://httpbin.org/status/200</h3>
+        repo=\\"http://httpbin.org/status/200\\"
 
         # Not a link
         http://not a link dot com