RewriteRule for dropping a specific string in a URL

Discuss practical ways rearrange URLs using mod_rewrite.

RewriteRule for dropping a specific string in a URL

Postby bb8011 » Thu Oct 02, 2008 11:12 am

Is it possible to craft a RewriteRule that drops a particular string in a URL?

For instance, I'd like to get:

http://foobar.org/cgi/i/image/image-idx ... =1;resnum=

to drop the "id=S-DJG-X-82.3%20WS82_3B;" but keep the rest of the URL string so ends up looking like this:

http://foobar.org/cgi/i/image/image-idx ... =1;resnum=

Yes, I know this URL is ugly long regardless.

I have tried what I can to do the above--but am fairly new to regexpressions and mod_rewrite. Any suggestions or alternative methods would be extremely helpful.
bb8011
 
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Postby richardk » Thu Oct 02, 2008 2:10 pm

Just "id=S-DJG-X-82.3%20WS82_3B;" or all "id="s?
Where are you putting the mod_rewrite?

Try
Code: Select all
Options +FollowSymLinks

RewriteEngine On

RewriteCond %{QUERY_STRING} ^(.*&)?id=S-DJG-X-82.3%20WS82_3B;(&.*)?$ [NC]
RewriteRule ^(cgi/i/image/image-idx)$ /$1?%1%2 [R=301,L]
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Postby bb8011 » Fri Oct 03, 2008 5:10 am

Richard

Sorry, let me start over...

I already have a mod_rewrite placed in an .htaccess file that includes a redirect. Currently this is what it looks like:

Code: Select all
Options +FollowSymLinks
Options +Indexes
RewriteEngine On
RewriteBase /cgi/i/image/
RewriteRule (IC-(.*)-X-(.*)) image-idx?id=S-$2-X-$3 [R,L]


This is to redirect a short URL we use for bookmarking. Once redirected, the context of "id=whatever" needs to be dropped from all future URLs--otherwise trying to use some tools on the page that generate new URLs end in an error.

So, to clarify, I'm looking to drop all "id="s. And I hope this makes sense.

Thanks for your help--you seem to be one of the most active and able to solve many problems people are having on here.
bb8011
 
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Postby richardk » Fri Oct 03, 2008 10:43 am

This is to redirect a short URL we use for bookmarking. Once redirected, the context of "id=whatever" needs to be dropped from all future URLs--otherwise trying to use some tools on the page that generate new URLs end in an error.

So, to clarify, I'm looking to drop all "id="s. And I hope this makes sense

It will also remove it from the redirect request (image-idx?id=S-$2-X-$3) unless there's something specific about it that can be matched.

Try
Code: Select all
Options +FollowSymLinks

RewriteEngine On

RewriteBase /cgi/i/image/

RewriteRule (IC-(.*)-X-(.*)) image-idx?id=S-$2-X-$3 [R,L]

RewriteCond %{QUERY_STRING} ^(.*&)?id=[^&]+(&.*)?$ [NC]
RewriteRule ^image-idx$ image-idx?%1%2 [R=301,L]
richardk
 
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Postby bb8011 » Mon Oct 06, 2008 5:54 am

Richard:
Tried your well thought out suggestion, unfortunately it isn't working.

The redirect from

Code: Select all
RewriteRule (IC-(.*)-X-(.*)) image-idx?id=S-$2-X-$3


still works too.

Thanks for your help, I will continue pounding away at this and hopefully come up with some solution.
bb8011
 
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Postby richardk » Mon Oct 06, 2008 11:23 am

What URL are you visiting? What should happen to it? (Visible redirection? To what?)

Where is the .htaccess file?

Try replacing
Code: Select all
^image-idx$

with
Code: Select all
^(.+/)?image-idx$
richardk
 
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Postby bb8011 » Mon Oct 06, 2008 11:47 am

What URL are you visiting? What should happen to it? (Visible redirection? To what?)


When visiting
http://digital.pk.wayne.edu/cgi/i/image ... =1;resnum=

There is no visible redirection to anything. The URL remains the same, rather than a redirect to the URL we are attempting to land at:

http://digital.pk.wayne.edu/cgi/i/image ... =1;resnum=


Where is the .htaccess file?


Its placed in the server's Document Root.

To reply to your last post, when I replace

Code: Select all
^image-idx$


with

Code: Select all
^(.+/)?image-idx$


The same happens--no visible redirect takes place and the server lands on

http://digital.pk.wayne.edu/cgi/i/image ... =1;resnum=

If you'd like to visualize this, step by step, you can first visit:

http://digital.pk.wayne.edu/IC-VMC-X-3007%5D3007

Once page redirects, try enlarging the image by clicking the box below the one that is filled in red.

Thanks again and apologies for my lack of clarity.
bb8011
 
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Postby richardk » Mon Oct 06, 2008 1:29 pm

Is /cgi a ScriptAlias?
Is the /cgi directory in your document root?

Try the following in your document root
Code: Select all
Options +FollowSymLinks

RewriteEngine On

RewriteRule ^IC-(.+-X-.+)$ /cgi/i/image/image-idx?id=S-$1 [R,L]


And this in /cgi/i/image/
Code: Select all
Options +FollowSymLinks

RewriteEngine On

RewriteCond %{QUERY_STRING} ^(.*&)?id=[^&]+(&.*)?$ [NC]
RewriteRule ^image-idx$ /cgi/i/image/image-idx?%1%2 [R=301,L]
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Postby bb8011 » Tue Oct 07, 2008 5:16 am

/cgi is not in the document root and is a ScriptAlias
Code: Select all
ScriptAlias           /cgi/ /l1/dlxs/cgi/


Placing
Code: Select all
Options +FollowSymLinks

RewriteEngine On

RewriteRule ^IC-(.+-X-.+)$ /cgi/i/image/image-idx?id=S-$1 [R,L]

in document root works with a visible redirect, however
Code: Select all
Options +FollowSymLinks

RewriteEngine On

RewriteCond %{QUERY_STRING} ^(.*&)?id=[^&]+(&.*)?$ [NC]
RewriteRule ^image-idx$ /cgi/i/image/image-idx?%1%2 [R=301,L]


in cgi/i/image still gives same error result. I'm guessing this is something to do with the /cgi ScriptAlias?
bb8011
 
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Postby richardk » Tue Oct 07, 2008 11:31 am

Does any mod_rewrite work in /l1/dlxs/cgi? Try this mod_rewrite test. You might not have mod_rewrite/.htaccess files enabled in it.

Mod_rewrite in your document root does not run for Aliases or ScriptAliases. The request goes directly to the Alias directory skipping the document root.
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