How many variables can I pass using RewriteRule?

[twist]

Passing 4 variables works fine,

RewriteRule ^page/([0-9]+)/([0-9]+)/([0-9]+)?$ /example.htm?var1=var&var2=$1&var3=$2&var4=$3 [L]

This isn't working,

RewriteRule ^page/([0-9]+)/([0-9]+)/([0-9]+)/([0-9]+)?$ /example.htm?var1=var&var2=$1&var3=$2&var4=$3&var5=$4 [L]

When I test, var5 equals nothing, the rest of the vars come through fine.

Any ideas?

[twist]

Nevermind, I found the problem.

I do have one further question though,

I've noticed certian words can't be used in the address string. So far sub and num seem to be part of a group of reserved words.

Is there a place to find a list of reserved words that don't work in .htaccess files?

[jdMorgan]

mod_rewrite supports up to nine back-references, $1 through $9.

Since you have followed the last variable group in the RewriteRule pattern with a "?", the rule can match even if only three variables are present in the incoming URL, and var5 would be blank in that case.

Other than that, I see nothing out of the ordinary here.

Jim

[twist]

Thanks for the quick reply, any thoughts on my other question?