Date: Mon, 12 Jan 2015 05:40:38 -1000 From: parv@pair.com To: f-q <freebsd-questions@freebsd.org> Subject: pkg-info: supplying word boundary in regex Message-ID: <20150112154038.GA41662@holstein.holy.cow>
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(Running pkg 1.4.4 on FreeBSD 8-STABLE here.)
Could somebody tell me please the syntax for word boundary in regex
for pkg-info ...
pkg info -x '...'
... ?
The pkg-info manual page says ...
-x, --regex
Treat pkg-name as a regular expression according to the "modern"
or "extended" syntax of re_format(7).
... and re_format man page says ...
There are two special cases= of bracket expressions: the bracket
expressions `[[:<:]]' and `[[:>:]]' match the null string at the
beginning and end of a word respectively. A word is defined as a
sequence of word characters which is neither preceded nor followed
by word characters. A word character is an alnum character (as
defined by ctype(3)) or an underscore.
... then specifying a word boundary as "x[[:>:]]" (to match "x" at the
end of a "word") causes "Invalid regex" error. For example, to get
result only for "tex" (avoiding packages with "text" as string in a
package name[0]) ...
# pkg info -x 'tex[[:>:]]'
pkg: sqlite error while executing iterator in file \
pkgdb_iterator.c:905: Invalid regex
Does pkg overstate its support for re_format(7) then?
- parv
[0] Yes, I realize if a name happens to be "text-tex" I would also
get a result & that would be expected. Common case is that
packages here have only either "text" or "tex" exclusively in
the name.
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