.htaccess - RewriteRule but not if URL contains -

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i need modify rewriterule not if parameter in url.

rewriterule ^img/potm/([^/]+) timthumb.php?src=img/potm/$1&h=112&w=160&zc=1

i'm thinking, if there special parameter in match, wont it? assume has done 2 rules right?

example

a url contain filename, www.example.com/img/potm/blah.jpg fall through rewriterule. bad url www.example.com/img/potm/blah.jpg?fail wont parsed rule.

to make rewriterule work if query string empty, have add line before rewriterule line:

rewritecond %{query_string} ^$

if rule in question actual rewrite rule, this:

rewritecond %{query_string} ^$ rewriterule ^img/potm/([^/]+) timthumb.php?src=img/potm/$1&h=112&w=160&zc=1

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