commit 70d56fb52582d9d3f7c00860d6e90570c6259371
author Serhiy Storchaka <storchaka@gmail.com> Mon Dec 04 14:29:05 2017 +0200
committer GitHub <noreply@github.com> Mon Dec 04 14:29:05 2017 +0200
tree 61e54b78f19535bfcf41d521b98def725de63497
parent e69fbb6a560a02d0587b9075afd338a1e9073af0

bpo-25054, bpo-1647489: Added support of splitting on zerowidth patterns. (#4471)

Also fixed searching patterns that could match an empty string.

Lib/doctest.py

diff --git a/Lib/doctest.py b/Lib/doctest.py
index 5e5bc21..c1d8a1d 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1611,7 +1611,7 @@
                           '', want)
             # If a line in got contains only spaces, then remove the
             # spaces.
-            got = re.sub(r'(?m)^\s*?$', '', got)
+            got = re.sub(r'(?m)^[^\S\n]+$', '', got)
             if got == want:
                 return True