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

'/guix/log/gnu/installer/user.scm'>
<input type='hidden' name='id' value='71a23462d9526bf383494016bc868b82ea88129f'/><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=71a23462d9526bf383494016bc868b82ea88129f'>root</a>/<a href='/guix/log/gnu?id=71a23462d9526bf383494016bc868b82ea88129f'>gnu</a>/<a href='/guix/log/gnu/installer?id=71a23462d9526bf383494016bc868b82ea88129f'>installer</a>/<a href='/guix/log/gnu/installer/user.scm?id=71a23462d9526bf383494016bc868b82ea88129f'>user.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/installer/user.scm?id=71a23462d9526bf383494016bc868b82ea88129f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
ref='/guix/commit/po/doc/local.mk?id=81824af6a4b30368ed497686976c26f742bc6c8a'>build: 'guix-manual.*.po' no longer depends on 'guix-manual.pot'.</a><span class='msg-avail'>...<span class='msg-tooltip'>That dependency was causing a failure when building from a fresh
checkout since commit d60225d5caabfb6409e3277c0512cd4c0fa63d72 because
'guix-manual.pot' was no longer around and there's no rule to make it.

This commit replaces the 'guix-manual.%.po' target by a phony target,
'doc-po-update-%', without any dependency.

* po/doc/local.mk ($(srcdir)/po/doc/guix-manual.%.po): Rename to...
(doc-po-update-%): ... this.  Remove dependencies.
Change how 'lang' is computed; compute $output and $input, and replace
occurrences of $@ and $&lt; with those.
(doc-po-update): Adjust accordingly.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-29 22:21:14 +0200'>2019-04-29</span></td><td><a href='/guix/commit/po/doc/local.mk?id=842a687264e4dd88e4aa7f608582d6adc0313a07'>maint: Mark 'doc-pot-update' and 'doc-po-update' as phony.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/local.mk (doc-pot-update, doc-pot-update): Mark as phony.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-24 00:27:51 +0200'>2019-04-24</span></td><td><a href='/guix/commit/po/doc/local.mk?id=de712e5286137c297de8270d3396b8daa9a93c66'>doc: Add Simplified Chinese translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/local.mk (info_TEXINFOS): Add guix.zh_CN.texi.
(TRANSLATED_INFO): Add guix.zh_CN.texi and contributing.zh_CN.texi.
* po/doc/local.mk (DOC_PO_FILES): Add guix-manual.zh_CN.po.
* doc/contributing.zh_CN.texi, doc/guix.zh_CN.texi: New files.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-23 23:56:16 +0200'>2019-04-23</span></td><td><a href='/guix/commit/po/doc/local.mk?id=6227e1b7477b71f31ea3bf8a74c32fe7238dcece'>doc: Add Spanish translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/local.mk (info_TEXINFOS): Add guix.es.texi.
(TRANSLATED_INFO): Add guix.es.texi and contributing.es.texi.
* po/doc/guix-manual.es.po: New file.
* po/doc/local.mk: Add guix-manual.es.po.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Miguel Ángel Arruga Vivas</td></tr>
<tr><td><span title='2018-11-28 22:23:55 +0100'>2018-11-28</span></td><td><a href='/guix/commit/po/doc/local.mk?id=7565d40e1e583b35148088bcf79760b9f95f91d9'>nls: Update documentation po and pot with `make dist`.</a><span class='msg-avail'>...<span class='msg-tooltip'>* Makefile.am: dist-hook depends on doc-po-update.
* po/doc/local.mk (doc-po-update): New target.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-11-01 12:36:47 +0100'>2018-11-01</span></td><td><a href='/guix/commit/po/doc/local.mk?id=1e40e70bfebba47ccea354ddf862276d2c4223ea'>doc: Add German translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/contributing.de.texi: New file.
* doc/guix.de.texi: New file
* doc/local.mk (TRANSLATED_INFO): Add them.
(info_TEXINFOS): Add guix.de.texi.
* po/doc/guix-manual.de.po: New file.
* po/doc/local.mk (EXTRA_DIST): Add it.
* doc/guix.texi: Document the German translation.
</span></span></td><td>Julien Lepiller</td></tr>