BSD awk bug ?

[KIRIYAMA Kazuhiko]

At Wed, 16 Aug 2017 10:36:36 +0900,
Tomoya Tabuchi wrote:
> 
> On Wed, Aug 16, 2017 at 10:14:46AM +0900, KIRIYAMA Kazuhiko wrote:
> > admin at tbedfpc:~/tmp % ll
> > total 12
> > -rw-r--r--  1 admin  admin  235 Aug 16 10:01 regex-1.sh
> > -rw-r--r--  1 admin  admin  236 Aug 16 10:01 regex-2.sh
> > -rw-r--r--  1 admin  admin  260 Aug 16 10:01 regex.sh
> > admin at tbedfpc:~/tmp % cat regex.sh 
> > #!/bin/sh
> > 
> > data='1 2 3 4 5 6
> > 1 2 3 4 5
> > 1 2 3 4 5 6
> > 1 2 3 4 5 6
> > 1 2 3 4
> > 1 2 3'
> > 
> > IFS=$'\n'
> > for datum in $data; do
> >     if echo "$datum" | egrep -q  '^([^[:space:]]+[[:space:]]+){5}'; then
> >         echo "$datum"
> >     else
> >         echo "Not 6 components! : \"$datum\""
> >     fi
> > done
> > admin at tbedfpc:~/tmp % sh ./regex.sh 
> > 1 2 3 4 5 6
> > Not 6 components! : "1 2 3 4 5"
> > 1 2 3 4 5 6
> > 1 2 3 4 5 6
> > Not 6 components! : "1 2 3 4"
> > Not 6 components! : "1 2 3"
> > admin at tbedfpc:~/tmp % cat regex-1.sh 
> > #!/bin/sh
> > 
> > _f_awk='
> > {
> >         if ($0 ~ /^([^[:space:]]+[[:space:]]+){5}/) {
> >                 print $0
> >         } else {
> >                 print "Not 6 components! : \"" $0 "\""
> >         }
> > }'
> > 
> > data='1 2 3 4 5 6
> > 1 2 3 4 5
> > 1 2 3 4 5 6
> > 1 2 3 4 5 6
> > 1 2 3 4
> > 1 2 3'
> > 
> > echo "$data" | awk "$_f_awk"
> > admin at tbedfpc:~/tmp % sh ./regex-1.sh 
> > Not 6 components! : "1 2 3 4 5 6"
> > Not 6 components! : "1 2 3 4 5"
> > Not 6 components! : "1 2 3 4 5 6"
> > Not 6 components! : "1 2 3 4 5 6"
> > Not 6 components! : "1 2 3 4"
> > Not 6 components! : "1 2 3"
> > admin at tbedfpc:~/tmp % cat regex-2.sh
> > #!/bin/sh
> > 
> > _f_awk='
> > {
> >         if ($0 ~ /^([^[:space:]]+[[:space:]]+){5}/) {
> >                 print $0
> >         } else {
> >                 print "Not 6 components! : \"" $0 "\""
> >         }
> > }'
> > 
> > data='1 2 3 4 5 6
> > 1 2 3 4 5
> > 1 2 3 4 5 6
> > 1 2 3 4 5 6
> > 1 2 3 4
> > 1 2 3'
> > 
> > echo "$data" | gawk "$_f_awk"
> > admin at tbedfpc:~/tmp % sh ./regex-2.sh
> > 1 2 3 4 5 6
> > Not 6 components! : "1 2 3 4 5"
> > 1 2 3 4 5 6
> > 1 2 3 4 5 6
> > Not 6 components! : "1 2 3 4"
> > Not 6 components! : "1 2 3"
> > admin at tbedfpc:~/tmp % uname -a
> > FreeBSD tbedfpc 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r321597: Thu Jul 27 12:30:57 UTC 2017     root at tbedfc:/usr/obj/usr/src/sys/GENERIC  amd64
> > admin at tbedfpc:~/tmp % pkg info -aI|grep gawk
> > gawk-4.1.4_1                   GNU version of Awk
> > admin at tbedfpc:~/tmp % 
> > 
> > 
> > Is this the BSD awk (/usr/bin/awk) bug ?
> > 
> > ---
> > KIRIYAMA Kazuhiko
> > _______________________________________________
> > freebsd-current at freebsd.org mailing list
> > https://lists.freebsd.org/mailman/listinfo/freebsd-current
> > To unsubscribe, send any mail to "freebsd-current-unsubscribe at freebsd.org"
> 
> Hello Kiriyama-san,
> 
> The man page awk(1) says that {m,n} matcning is not supported. The "{5}"
> part matches the literal sequence of characters it's made out of, I suppose.

Oops. I missed "STANDARDS" section. Thanks for pointed out.

# But as it says in front "awk supports extended regular
# expressions (EREs).  See re_format(7) for more information
# on regular expressions.", I'd like to coinside with
# re_format(7) spec.

> 
> Someone please correct me if I'm wrong.
> 
> Regards,
> Tomoya
> _______________________________________________
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> 

---
KIRIYAMA Kazuhiko