bug#38661: sed 4.4 : Bogus expression generates an Exception ignored message

[Alejandro Torras]

Greetings,

I've been hit by an 'Exception ignored' message while working on the following 
bogus sed expression:

$ lsb_release -d | sed -E -e 's:^[^:]+:[\t ]*(.*):\1:'
sed: -e expression #1, char 21: unknown option to `s'
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' 
encoding='UTF-8'>
BrokenPipeError: [Errno 32] Broken pipe
$ sed --version
sed (GNU sed) 4.4
Copyright (C) 2017 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by Jay Fenlason, Tom Lord, Ken Pizzini,
and Paolo Bonzini.
GNU sed home page: <http://www.gnu.org/software/sed/>.
General help using GNU software: <http://www.gnu.org/gethelp/>.
E-mail bug reports to: <address@hidden>.
$ uname -a
Linux XXX 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 
x86_64 x86_64 GNU/Linux

Playing around I've found another way to generate the same error (without the 
-E switch):

$ lsb_release -d | sed -e 's:^[^:]+[\t ]*(.*):\1:'
sed: -e expression #1, char 22: invalid reference \1 on `s' command's RHS
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' 
encoding='UTF-8'>
BrokenPipeError: [Errno 32] Broken pipe

IMHO I think the "Exception ignored" message should not be raised, as it's 
caused by a formal error in the syntax and it was correctly reported before.
Could you give it a sight?

Thank you in advance!



Alejandro Torras

Software Engineer​



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