From: Steffen Nurpmeso <steffen@sdaoden.eu>
To: musl@lists.openwall.com
Subject: Regex: behaviour of ? after () atom
Date: Fri, 07 Sep 2018 15:38:05 +0200 [thread overview]
Message-ID: <20180907133805.FZif_%steffen@sdaoden.eu> (raw)
Hello.
In perl this is
$x="print 1 2";
if($x =~ /^(:[[:space:]]+)?([^[:space:]]+)(.*)$/){
print "<$0> -> <$1> <$2> <$3>\n"
}
and the result is
</tmp/t.pl> -> <> <print> < 1 2>
Now the same on AlpineLinux edge and musl-1.1.19-r10 with the MUA
i maintain, which uses the normal regex stuff and calls it via
echo eins=$3
vput vexpr i regex "${3}" \
'^(:[[:space:]]+)?([^[:space:]]+)(.*)$' \
'<\$0> -> <\$1> <\$2> <\$3>'
echo i=$i
which in C code does
if((reflrv = regcomp(&re, argv[2], reflrv))){
...
goto jestr;
}
fprintf(stderr, "GOING for <%s> -> <%s> %u\n",
argv[1],argv[2],n_NELEM(rema));
reflrv = regexec(&re, argv[1], n_NELEM(rema), rema, 0);
and overall prints
eins=print 1 2
GOING for <print 1 2> -> <^(:[[:space:]]+)?([^[:space:]]+)(.*)$> 17
i=<print 1 2> -> <> <> <>
It works correctly if i remove the ()? atom, so i thought i should
report that.
Ciao,
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
next reply other threads:[~2018-09-07 13:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-07 13:38 Steffen Nurpmeso [this message]
2018-09-07 15:18 ` Rich Felker
2018-09-07 15:25 ` Steffen Nurpmeso
2018-09-07 15:33 ` Rich Felker
2018-09-07 16:00 ` Steffen Nurpmeso
2018-09-07 16:08 ` Rich Felker
2018-09-07 16:22 ` Steffen Nurpmeso
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180907133805.FZif_%steffen@sdaoden.eu \
--to=steffen@sdaoden.eu \
--cc=musl@lists.openwall.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/musl/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).