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Posted to users@httpd.apache.org by Gary Wilson <gw...@plus.net> on 2005/03/22 11:53:29 UTC
[users@httpd] Regexps in rewrite rules
I understand that Apache 2.0 uses Perl style regexps. With this in
mind, I wrote the following rewrite rule to force a mime type of a
CGI application for antyhing under /cgi-bin EXCEPT files inding in
.html - however the rule always returns "Not matched" in the rewrite
logs, and no matter how I attempt this rule, it never seems to match.
Other rules I have written with more vanilla regular expressions all
work fine, but I can't seem to do the following negation successfully.
RewriteRule /cgi-bin/.*(?!\.html
$) /local/apache/cgi-bin/cgiwrap/%{ENV:UID}/$1
[T=application/x-httpd-cgi,NS]
Can anyone advise what is wrong with this rule please?
Thanks
GW
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Re: [users@httpd] Regexps in rewrite rules
Posted by Brian V Hughes <br...@Dartmouth.EDU>.
On Mar 22, 2005, at 10:55 AM, Gary Wilson wrote:
> Still interested as to why my original solution won't work though
> (I tried with and without line terminator etc - in fact I've tried over
> 10 incarnations of that regexp - just can't seem to get perl style
> negations working under apache) - but that's for another time and
> place now :)
The simplest answer for why your original rule didn't work is you can't
use back references with "not match" patterns. Remember that a "not
match" is the same as accepting a failure to match. If you fail to
match, then there won't be anything matched on that you can store in a
back reference.
-Brian
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Re: [users@httpd] Regexps in rewrite rules
Posted by Gary Wilson <gw...@plus.net>.
On Tue, 2005-03-22 at 09:03 -0500, Joshua Slive wrote:
> Although I'm not a regex expert, I can see a number of things that
> could be wrong there, such as including the line termination character
> inside the () and the fact that the $1 will always be empty. But why
> not just avoid the problem by using something like:
>
> RewriteCond %{REQUEST_URI} !.*\.html$
> RewriteRule /cgi-bin/(.*) /local/apache/cgi-bin/cgiwrap/%{ENV:UID}/$1
> [T=application/x-httpd-cgi,NS]
Joshua,
Thanks for that alternate solution, which works nicely with my other
rules and does what it says on the tin :)
Still interested as to why my original solution won't work though
(I tried with and without line terminator etc - in fact I've tried over
10 incarnations of that regexp - just can't seem to get perl style
negations working under apache) - but that's for another time and
place now :)
Thanks again
GW
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Re: [users@httpd] Regexps in rewrite rules
Posted by Joshua Slive <js...@gmail.com>.
On Tue, 22 Mar 2005 10:53:29 +0000, Gary Wilson <gw...@plus.net> wrote:
>
> I understand that Apache 2.0 uses Perl style regexps. With this in
> mind, I wrote the following rewrite rule to force a mime type of a
> CGI application for antyhing under /cgi-bin EXCEPT files inding in
> .html - however the rule always returns "Not matched" in the rewrite
> logs, and no matter how I attempt this rule, it never seems to match.
>
> Other rules I have written with more vanilla regular expressions all
> work fine, but I can't seem to do the following negation successfully.
>
> RewriteRule /cgi-bin/.*(?!\.html
> $) /local/apache/cgi-bin/cgiwrap/%{ENV:UID}/$1
> [T=application/x-httpd-cgi,NS]
>
> Can anyone advise what is wrong with this rule please?
Although I'm not a regex expert, I can see a number of things that
could be wrong there, such as including the line termination character
inside the () and the fact that the $1 will always be empty. But why
not just avoid the problem by using something like:
RewriteCond %{REQUEST_URI} !.*\.html$
RewriteRule /cgi-bin/(.*) /local/apache/cgi-bin/cgiwrap/%{ENV:UID}/$1
[T=application/x-httpd-cgi,NS]
Joshua.
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