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* [Bug regex/26653] New: regex mishandles \b inside interval expressions
@ 2020-09-23 0:38 eggert at cs dot ucla.edu
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From: eggert at cs dot ucla.edu @ 2020-09-23 0:38 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=26653
Bug ID: 26653
Summary: regex mishandles \b inside interval expressions
Product: glibc
Version: 2.32
Status: NEW
Severity: normal
Priority: P2
Component: regex
Assignee: unassigned at sourceware dot org
Reporter: eggert at cs dot ucla.edu
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Created attachment 12855
--> https://sourceware.org/bugzilla/attachment.cgi?id=12855&action=edit
test program illustrating the \b-inside-interval regex bug
The glibc regular expression code mishandles extended regular expressions such
as:
(.*\band){2}
although it correctly processes equivalent expressions such as:
(.*(\<|\>)and){2}
There is a similar problem with the same regular expression in BRE syntax:
\(.*\band\)\{2\}
To reproduce the problem, compile and run the attached file b-interval-bug.c.
It will exit with status 1, whereas the correct exit status is 0.
This bug was reported against GNU 'sed' here:
https://bugs.gnu.org/41558
and the original posting is from StackExchange, here:
https://unix.stackexchange.com/questions/579889/why-doesnt-this-sed-command-replace-the-3rd-to-last-and
The original posting mentions backreferences but the bug occurs even without
backreferences.
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2020-09-23 0:38 [Bug regex/26653] New: regex mishandles \b inside interval expressions eggert at cs dot ucla.edu
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