# HG changeset patch
# User Kyle Lippincott <spectral@google.com>
# Date 2019-12-05 22:01:26
# Node ID 3fe91bcd51990c8182fb454c42b0e8684efd0680
# Parent  fe94af4e3dc926cf2d4d5771f1a10ebb906a526c

tests: fix deprecation warning about regex flags not at beginning of expr

This may only show up when running the tests under python3.6+. Currently the
only test that does this is test-patchbomb-tls.t, and it only uses (?i), so
that's all that's handled at the moment.

Differential Revision: https://phab.mercurial-scm.org/D7552

diff --git a/tests/run-tests.py b/tests/run-tests.py
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -1973,7 +1973,11 @@ class TTest(Test):
     @staticmethod
     def rematch(el, l):
         try:
-            el = b'(?:' + el + b')'
+            # parse any flags at the beginning of the regex. Only 'i' is
+            # supported right now, but this should be easy to extend.
+            flags, el = re.match(br'^(\(\?i\))?(.*)', el).groups()[0:2]
+            flags = flags or b''
+            el = flags + b'(?:' + el + b')'
             # use \Z to ensure that the regex matches to the end of the string
             if os.name == 'nt':
                 return re.match(el + br'\r?\n\Z', l)