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Maybe is best way to show my problem in one example.

In my .htaccess :

RewriteRule ^catalog/[a-z0-9_-]+-([0-9]+)/[a-z0-9_-]+-([0-9]+)/[a-z0-9_-]+-([0-9]+)/  index.php?act=catalog&category=$1&color=$2&size=$3 [NC,L]

With the address www.site.com/catalog/category-1/red-3/size-3/ this works excellent

But if you leave out the size, like www.site.com/catalog/category-1/red-3/, I will be redirected to www.site.com.

I want to show all articles with category ID 1 and color which is ID 3.

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migrated from stackoverflow.com Jun 20 '11 at 3:54

This question came from our site for professional and enthusiast programmers.

    
for syntax errors : lyxx.com/freestuff/002.html – Eray Jun 19 '11 at 20:27
    
So you're saying you want the last directory, e.g. size-3, to be optional? – Jason McCreary Jun 19 '11 at 20:27
    
Yes .. can i set some directory to be optional ?? – user778441 Jun 19 '11 at 20:31

You will need to write another rewrite rule to match the option of not having a size specified:

RewriteRule ^catalog/[a-z0-9_-]+-([0-9]+)/[a-z0-9_-]+-([0-9]+)/ index.php?act=catalog&category=$1&color=$2 [NC, L]

Put that as your second rewrite since it is the least specific.

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I would like to define a directory as an optional if possible – user778441 Jun 19 '11 at 20:35
    
You are going to need two rewrite rules, one that matches one regexp and one that matches the other. I'll update my answer with more info – Connor Smith Jun 19 '11 at 20:38
    
You can't necessarily set one as optional, you just have to make more lines to match all possible options (: – Connor Smith Jun 19 '11 at 20:45

You can have optional parts, if your PHP script accepts an empty size parameter and then does what you want.

Try this:

RewriteRule ^catalog/[a-z0-9_-]+-([0-9]+)/[a-z0-9_-]+-([0-9]+)/([a-z0-9_-]+-([0-9]+)/)?  index.php?act=catalog&category=$1&color=$2&size=$4 [NC,L]

The important changes are one more parenthesized group, followed by an ? (to make it optional), and an adaption of the capture number from $3 to $4 (since the capturing group for the size is now the 4th one). (Instead of the number change we could also have used (?: instead of the added (, I guess.)

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