.htacces RewriteRule problem

Question

This is working:

RewriteRule ^([a-z]{2}/){0,1}showCategory/([0-9]*)/([0-9]*)(/{0,1})$                /main.php?id=$2&il[lang]=$1&page=$3 [L]

with this URL:

http://localhost/showCategory/590/10

Now I want to work with this too:

http://localhost/showCategory/590/transport/10

The rule I tried:

RewriteRule ^([a-z]{2}/){0,1}showCategory/([0-9]*)/([a-z\-_0-9\+]*)/([0-9]*)(/{0,1})$               /main.php?id=$2&il[lang]=$1&page=$3 [L]

How to change the RewriteRule?

Answer 1

Try this rule:

RewriteRule ^([a-z]{2}/)?showCategory/([0-9]+)/[a-z-_0-9+]+/([0-9]+)/?$ /main.php?id=$2&il[lang]=$1&page=$3 [L]

Answer 2

This one works with both URLs

RewriteRule ^([a-z]{2}/)?showCategory/([0-9]+)(?:/[A-Za-z0-9_-]+)?/?([0-9]+)/?$  /main.php?id=$2&il[lang]=$1&page=$3 [L]

I also simplified the {0,1} with ? which does the same.

The key is in (?:/[A-Za-z0-9_-]+)?, explanation:

(?:                   Non-capturing group, so what's in here will not be put in any $n
  /                   Match the slash
  [A-Za-z0-9_-]+      Match any word with letters/numbers/dashes/underscores
)?                    Close non-capturing group, and the ? means it's optional