You don't know about the "grep" command-line tool? (It's written in C and comes with every kind of unix / linux / unix-tools-for-windows -- it's been around for decades.) Whatever time it takes for this to run at the command line: 
grep 2007-07-13 big_iis.log

[download]
is going to be pretty much as fast as it can ever be done.

In reply to Re: How to quickly parse a huge web log file? by graff
in thread How to quickly parse a huge web log file? by dbmathis

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