This was fixed in 5.17.3 by the following commit:
commit 34b39fc9cd81fbff0d52451a5c4570293817ca32
Author: Karl Williamson <public@khwilliamson.com>
Date: Thu Aug 9 14:38:03 2012 -0600
regcomp.c: Set flags when optimizing a [char class]
A bracketed character class containing a single Latin1-range chara
+cter
has long been optimized into an EXACT node. Also, flags are set t
+o
include SIMPLE. However, EXACT nodes containing code points that
+are
different when encoded under UTF-8 versus not UTF-8 should not be
+marked
simple.
To fix this, the address of the flags parameter is now passed to
regclass(), the function that parses bracketed character classes,
+which
now sets it appropriately. The unconditional setting of SIMPLE th
+at was
always done in the code after calling regclass() has been removed.
In addition, the setting of the flags for EXACT nodes has been pus
+hed
into the common function that populates them.
regclass() will also now increment the naughtiness count if optimi
+zed to
a node that normally does that. I do not understand this heuristi
+c
behavior very well, and could not come up with a test case for it;
experimentation revealed that there are no test cases in our test
+suite
for which naughtiness makes any difference at all.
Dave.
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