Add a trailing slash on a mod_rewrite rule

I'm very new with mod_rewrite and I'm trying to get my own rules... I have this simple line:

RewriteRule  ^concorso/(.*)/$    concorso/?iModule=13&iData=$1   [L]

It is working with URLs like: http://www.mysite.com/concorso/2/ but not with URLs like http://www.mysite.com/concorso/2 (no trailing slash)

I know that maybe this is a very common issue, but all the examples I find online are.. "oversized" for this simple rule

So, how can I automatically add a trailing slash? Please notice that a rule like:

RewriteRule    ^contatti/$    contatti/?iModule=10    [L]

adds automatically a slash... And I tried also:

RewriteRule  ^concorso/(.*)/?$    concorso/?iModule=13&iData=$1   [L]

(last slash optional) but I get Apache errors:

[Wed Dec 29 10:02:41 2010] [error] [client 127.0.0.1] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecu开发者_JAVA百科rsion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.

127.0.0.1 - - [29/Dec/2010:10:02:41 +0100] "GET /concorso/2/ HTTP/1.1" 500 535

Thanks for your help!

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Try restricting the characters that the pattern will accept to prevent your pattern from matching what you are rewriting to. For example, if you only want to match urls /concorso/### where ### are digits:

RewriteRule  ^concorso/([0-9]+)/?$    concorso/?iModule=13&iData=$1   [L]

More generally, this will work by only matching URLs without query strings:

RewriteRule  ^concorso/([^?]*)/?$    concorso/?iModule=13&iData=$1   [L]