Arran Cudbard-Bell wrote:
Alan DeKok wrote:
Arran Cudbard-Bell wrote:
Hi,
Got this on my 32bit intel box running Ubuntu Linux 6.10
if("%{User-Name}" =~ /(?:.*)/){
I'm not sure that's a valid regular expression... '?' is usually a
modifier...
It is...
It allows you to create backreferences but not capture the result
directly.
http://www.regular-expressions.info/brackets.html
Pretty sure it's supported with the PCRE library.
man pcre
SUBPATTERNS
Subpatterns are delimited by parentheses (round brackets), which can be
nested. Turning part of a pattern into a subpattern does two things:
1. It localizes a set of alternatives. For example, the pattern
cat(aract|erpillar|)
matches one of the words "cat", "cataract", or "caterpillar". Without
the parentheses, it would match "cataract", "erpillar" or an empty
string.
2. It sets up the subpattern as a capturing subpattern. This means
that, when the whole pattern matches, that portion of the subject
string that matched the subpattern is passed back to the caller via the
ovector argument of pcre_exec(). Opening parentheses are counted from
left to right (starting from 1) to obtain numbers for the capturing
subpatterns.
For example, if the string "the red king" is matched against the pat-
tern
the ((red|white) (king|queen))
the captured substrings are "red king", "red", and "king", and are num-
bered 1, 2, and 3, respectively.
The fact that plain parentheses fulfil two functions is not always
helpful. There are often times when a grouping subpattern is required
without a capturing requirement. If an opening parenthesis is followed
by a question mark and a colon, the subpattern does not do any captur-
ing, and is not counted when computing the number of any subsequent
capturing subpatterns. For example, if the string "the white queen" is
matched against the pattern
the ((?:red|white) (king|queen))
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1213196608 (LWP 6433)]
0xb7bc9492 in regexec () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0 0xb7bc9492 in regexec () from /lib/tls/i686/cmov/libc.so.6
It might be a bug in the regular expression library...
#1 0x0806d6a9 in ?? ()
Ugh. 2.0.x *should* be built with debugging symbols, and should *not*
be stripped of those symbols before being installed.
Yes, and this is from CVS. I'll rebuild with the debug flags...
Ok with --enable-developer , it's exactly the same. Grrr
Alan DeKok.
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--
Arran Cudbard-Bell ([EMAIL PROTECTED])
Authentication, Authorisation and Accounting Officer
Infrastructure Services | ENG1 E1-1-08
University Of Sussex, Brighton
EXT:01273 873900 | INT: 3900
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