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#!/usr/bin/perl -w
#
# Proof-of-concept for using minimal memory to search huge
...

    close(F);
}

while ( $window =~ m/$re/oigcs ) {
            &$callback($1);
        }

while ( $window =~ m/\w{3}\s{1,2}\d{1,2}.*$re.*\n/oigc ) {
            &$callback($1);
        }

Feb 24 04:03:47 server sendmail[]: khdkahsdad876sad8: to=<sample@colle
+geclub.com>, delay=1+13:12:11, xdelay=00:00:00, mail
er=esmtp, pri=25672345, relay=collegeclub.com., dsn=4.0.0, stat=Deferr
+ed: Connection timed out with collegeclub.com.
Feb 24 04:03:47 server sendmail[31356]: madhksadkh5574: to=<sample@iit
+.edu>, delay=1+13:20:32, xdelay=00:00:00, mailer=esmtp,
 pri=26574dffd, relay=sample.iit.edu. [006.47.143.000], dsn=4.3.1, sta
+t=Deferred: 452 sample 4.2.1 Mailbox temporarily disabled: sample@iit
+.edu