bpo-12915: Improve Unicode support for package names and attributes.

[vsajip]

Support for Unicode characters in package names and attributes has been improved by changing the regular expression used for matching.

https://bugs.python.org/issue12915

[codecov]

Codecov Report

Merging #18517 into master will increase coverage by 0.99%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master   #18517       +/-   ##
===========================================
+ Coverage   82.20%   83.20%    +0.99%     
===========================================
  Files        1958     1571      -387     
  Lines      589739   414744   -174995     
  Branches    44456    44457        +1     
===========================================
- Hits       484793   345086   -139707     
+ Misses      95287    60012    -35275     
+ Partials     9659     9646       -13     

Impacted Files	Coverage Δ
Lib/distutils/tests/test_bdist_rpm.py	30.00% <0.00%> (-65.00%)	⬇️
Lib/distutils/command/bdist_rpm.py	7.63% <0.00%> (-56.88%)	⬇️
Lib/test/test_urllib2net.py	76.92% <0.00%> (-13.85%)	⬇️
Lib/test/test_smtpnet.py	78.57% <0.00%> (-12.86%)	⬇️
Lib/ftplib.py	63.85% <0.00%> (-6.06%)	⬇️
Lib/test/test_ftplib.py	87.11% <0.00%> (-4.72%)	⬇️
Lib/dbm/__init__.py	66.66% <0.00%> (-4.45%)	⬇️
Tools/scripts/db2pickle.py	17.82% <0.00%> (-3.97%)	⬇️
Lib/test/test_socket.py	71.94% <0.00%> (-3.87%)	⬇️
Tools/scripts/pickle2db.py	16.98% <0.00%> (-3.78%)	⬇️
... and 432 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1ed6161...698895a. Read the comment docs.

[aixtools]

Starting with this merge AIX bot fails with:

ERROR: test_name_resolution (test.test_pkgutil.PkgutilTests)

Traceback (most recent call last):
File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/test/test_pkgutil.py", line 249, in test_name_resolution
os.makedirs(d, exist_ok=True)
File "/home/buildbot/buildarea/3.x.aixtools-aix-power6/build/Lib/os.py", line 223, in makedirs
mkdir(name, mode)
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 17-19: ordinal not in range(256)