Fix regex so that it works with Python 3.6.

See <https://docs.python.org/3/library/re.html#re.LOCALE>.

Copied from upstream bug report:
https://bugs.launchpad.net/python-mox3/+bug/1665266

From 05064cdb6ea7a16450c6beae2b6f7c6074212a69 Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Thu, 16 Feb 2017 00:24:10 -0800
Subject: [PATCH] RegexTest: python3.6 compatibility

These fixes are backward-compatible with older python versions:

* raw strings fix invalid escape sequences
* flags=8 fixes ValueError: cannot use LOCALE flag with a str pattern
---
 mox3/tests/test_mox.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mox3/tests/test_mox.py b/mox3/tests/test_mox.py
index 15ac565..3a1af17 100644
--- a/mox3/tests/test_mox.py
+++ b/mox3/tests/test_mox.py
@@ -312,12 +312,12 @@ class RegexTest(testtools.TestCase):
     def testReprWithoutFlags(self):
         """repr should return the regular expression pattern."""
         self.assertTrue(
-            repr(mox.Regex(r"a\s+b")) == "<regular expression 'a\s+b'>")
+            repr(mox.Regex(r"a\s+b")) == r"<regular expression 'a\s+b'>")
 
     def testReprWithFlags(self):
         """repr should return the regular expression pattern and flags."""
-        self.assertTrue(repr(mox.Regex(r"a\s+b", flags=4)) ==
-                        "<regular expression 'a\s+b', flags=4>")
+        self.assertTrue(repr(mox.Regex(r"a\s+b", flags=8)) ==
+                        r"<regular expression 'a\s+b', flags=8>")
 
 
 class IsTest(testtools.TestCase):
-- 
2.10.2

ht' method='get' action='/guix/log/gnu/packages/iso-codes.scm'>
<input type='hidden' name='id' value='cd158a2b775b1d9b281fc48af537d615d2492e56'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=cd158a2b775b1d9b281fc48af537d615d2492e56'>root</a>/<a href='/guix/log/gnu?id=cd158a2b775b1d9b281fc48af537d615d2492e56'>gnu</a>/<a href='/guix/log/gnu/packages?id=cd158a2b775b1d9b281fc48af537d615d2492e56'>packages</a>/<a href='/guix/log/gnu/packages/iso-codes.scm?id=cd158a2b775b1d9b281fc48af537d615d2492e56'>iso-codes.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/iso-codes.scm?id=cd158a2b775b1d9b281fc48af537d615d2492e56&amp;showmsg=1'>Expand</a>)</th><th <tr><td><span title='2016-11-2<tr><td><span title='2016-09-28 17:54:50 +0300'>2016-09-28</span></td><td><a href='/guix/commit/gnu/packages/iso-codes.scm?id=b94a6ca074f00b3f769933d074853d3c3ca50d00'>gnu: Add and use gettext-minimal.</a><span class='msg-avail'>...</span></td><td>Alex Kost</td></tr>
<tr><td><span title='2016-04-03 07:43:41 +0300'>2016-04-03</span></td><td><a href='/guix/commit/gnu/packages/iso-codes.scm?id=e94616b9966571cfbcd74f970903f4dd3f6efa2b'>gnu: iso-codes: Update to 3.67.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>