Hi guys!
I created this rewrite rule:

RewriteRule ^corsi/([a-z\-]*)[^\.a-z] search.php?tag=$1 [L]

It should filter URL:
the one with extension (.php, .htm, .asp and so on) is not rewritten, all the others (ie. corsi/new-class-for-kids) are rewritten to search.php?tag=xxxxxx
It works, but it returns me only a part of the querystring:
the link corsi/new-class-for-kids is rewritten in search.php?tag=new-class-for (note that a part of querystring is missing).

Can anyone help me?

I changed the rule in:

RewriteRule ^corsi/([a-z\-]+)[^\.a-z{3,4}]? search.php?tag=$1 [L]

Now the querystring issue has gone. But now if I type corsi/something.php the rules rewrites the URL (I don't want the rewriting method if the url contains the extension).

Any idea?

Issue solved, now it works.

RewriteEngine On
#rewrites the url to search.php if the URL has no extension only (php or any other else)
RewriteCond %{SCRIPT_FILENAME} !\.[a-z] 
RewriteRule ^corsi/([a-z\-]+) search.php?tag=$1 [L]