It sounds like performance is a big concern. if you expect to be processing tons of log files int he future then you may want to avoid reinvienting the wheel and instead go with something like Splunk. It uses the Perl Compatible Regular Expression (PCRE) library so creating your search queries shouldn't be too hard (and you can even do soem uick testing in Perl 5.10). It also has tool to help build quesries and you can create views, etc.

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