Tools/scripts/fixcid.py initially used old regex module. In 4727f260f6f8 it was converted to using new re module, but not all generated regular expressions were converted to new syntax. The script is not working since that time.

It would be nice to fix this so that the tests pass with -Werror. Here is a quick patch:

* Fix the deprecated non-escapes
* Make all the regular expressions raw strings
* Fix bugs with parsing escaped quotes in C strings and char literals
* Adapt from old regex module and Python 2 print statements
* Add a new test file with a single test case (could easily be expanded)

Documentation for the old “regex” module:
https://docs.python.org/release/1.6/lib/module-regex.html

Thanks Martin. The patch in general LGTM, but see comments on Rietveld.

New patch with more fixes and test cases. Also dropped some of the less useful raw string changes.

New changeset 740e43eb8138 by Martin Panter in branch '2.7':
Issue #27952: Get fixcid.py working with the re module
https://hg.python.org/cpython/rev/740e43eb8138

New changeset ca68bb597df9 by Martin Panter in branch '3.5':
Issue #27952: Get fixcid.py working with the re module
https://hg.python.org/cpython/rev/ca68bb597df9

New changeset 8dde3dcab1e8 by Martin Panter in branch 'default':
Issue #27952: Merge fixcid.py from 3.5
https://hg.python.org/cpython/rev/8dde3dcab1e8

Can we silence the debug output?

./python -m test  test_tools
Run tests sequentially
0:00:00 [1/1] test_tools
*recursedown('@test_20410_tmp')
1 test OK.

Total duration: 4 sec
Tests result: SUCCESS

New changeset 5ae3782c4e05 by Berker Peksag in branch '3.5':
Issue #27952: Capture stderr in run_script()
https://hg.python.org/cpython/rev/5ae3782c4e05

New changeset 33d118a27035 by Berker Peksag in branch '3.6':
Issue #27952: Merge from 3.5
https://hg.python.org/cpython/rev/33d118a27035

New changeset 6acd2b575a3c by Berker Peksag in branch 'default':
Issue #27952: Merge from 3.6
https://hg.python.org/cpython/rev/6acd2b575a3c

Done. I'm going to pretend 2.7 doesn't exist :)