Your message dated Fri, 4 Dec 2015 20:18:48 +0100
with message-id <[email protected]>
and subject line Re: Bug#687922: dash: pattern match failure in case
has caused the Debian Bug report #687922,
regarding dash: pattern match failure in case
to be marked as done.
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--
687922: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=687922
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: dash
Version: 0.5.7.3
$ dash -c 'case foo-rev0 in *-rev*[^0-9]*) echo boom;; esac'
boom
Problem seen in 0.5.5.1-3ubuntu2, still present in wheezy. All other tested
shells
(bas, zsh) behave as expected, only dash seems to think there is a non-numeral
somewhere after "-rev".
--
Yann Dirson - Bertin Technologies
--- End Message ---
--- Begin Message ---
Hi,
this is a not bug in dash; the problem is in the way the matching
pattern is written: it should use `!` instead of `^` to negate the
expression.
Instead of
*-rev*[^0-9]*
one should use
*-rev*[!0-9]*
`checkbashisms` warns about this problem:
possible bashism in test.sh line 1 ([^] should be [!])
The POSIX specs [1] say:
If an open bracket introduces a bracket expression as in XBD RE
Bracket Expression, except that the <exclamation-mark> character (
'!') shall replace the <circumflex> character ( '^' ) in its role in
a non-matching list in the regular expression notation, it shall
introduce a pattern bracket expression. A bracket expression
starting with an unquoted <circumflex> character produces unspecified
results.
[1]
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_13
Regards,
--
Gioele Barabucci <[email protected]>
--- End Message ---
