apache RewriteCond - how to log only the matches

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http://serverfault.com – I have a working RewriteCond and RewriteRule in apache on a busy server. I don't want to duplicate what's already in the apache logs. I only want to log the matches to the conditions. I've tried every RewriteLogLevel from 1 to 9 and still see every request. Is there a way to just log the matches ? Thanks in advance. (HowTos)