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    <p>So your question looks like this, if I understand correctly:</p> <ul> <li>The log file has a number of sections seperated by double newline.</li> <li>Each is headed by a line with a date etc..</li> <li>We are only interested in the sections whose headers match <code>/BaseServlet.*?Site-102/</code>.</li> <li>If the body of a section matches <code>/^TechnicalDifficultiesException: TD page delivered by handleThrowable/</code>, we want to select the body of the previously matched section, which we should maybe validate to look like a java exception.</li> <li>We process the whole log file, and return the last exception found this way.</li> </ul> <p>Fair enough.</p> <pre><code>#!/usr/bin/perl use strict; use warnings; local $/ = ""; # paragraph mode my ($prev_sec, $prev_err); SECTION: while (my $head = &lt;&gt;) { my $body = &lt;&gt;; defined $body or die "Can't read from empty filehandle."; next SECTION unless $head =~ /BaseServlet.*?Site-102/; if ($body =~ /^TechnicalDifficultiesException: TD page delivered by handleThrowable/) { $prev_err = $prev_sec; } $prev_sec = $body; } die "No error found" unless defined $prev_err; print $prev_err; </code></pre> <p>(not really tested that much, but prints out the error from your snippet)</p> <p>The code is a bit to long for a one-liner. You could always pipe the source into the perl interpreter, if you wanted.</p> <pre><code>perl -ne'BEGIN{$/=""}END{print$prev_err}$b=&lt;&gt;;defined$b or die"empty FH";/BaseServlet.*?Site-102/ or next;$prev_err=$prev_sec if $b=~/^TechnicalDifficultiesException: TD page delivered by handleThrowable/;$prev_sec=$b' </code></pre> <p>Specify the log file as a command line argument, or pipe the file contents directly into that program. Finding the correct log file isn't hard. In a snippet of Perl:</p> <pre><code>my $log_dir = ...; my ($log) = sort glob "$log_dir/LOG*"; die "no log in $log_dir" unless defined $log; </code></pre> <hr> <h3>Update</h3> <p>If the date should be captured as well, the code would change to</p> <pre><code>#!/usr/bin/perl use strict; use warnings; local $/ = ""; # paragraph mode my (@prev, @prev_err); SECTION: while (my $head = &lt;&gt;) { my $body = &lt;&gt;; defined $body or die "Can't read from empty filehandle."; next SECTION unless $head =~ /BaseServlet.*?Site-102/; if ($body =~ /^TechnicalDifficultiesException: TD page delivered by handleThrowable/) { @prev_err = @prev; } @prev = ($head, $body); } die "No error found" unless @prev_err; my ($date) = $prev_err[0] =~ /^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d),/; print "$date\n\n$prev_err[1]"; </code></pre> <p>And as the one-liner:</p> <pre><code>perl -ne'BEGIN{$/=""}END{@perr||die"No error found";($date)=$perr[0]=~/^(\d{4}-\d\d-\d\d \d\d:\d\d:\d\d),/;print"$date\n\n$perr[1]"}$b=&lt;&gt;;defined$b or die"empty FH";/BaseServlet.*?Site-102/ or next;@perr=@p if $b=~/^TechnicalDifficultiesException: TD page delivered by handleThrowable/;@p=($_,$b)' </code></pre> <p>I don't understand how it could only return the first match; this code should process the whole file. If you could provide a more complete testcase, I could verify that this code works as required.</p>
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    1. POHow to scrape multiple log files for an exception
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    1. POHow to scrape multiple log files for an exception
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    1. COGreat answer, amon! It only seems to get the first match, and not the last as of requirement #3. Also, just an FYI: the one-line is missing a '/' after the '$b=~'.
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    2. COIt's also not pulling in the date. I capture the date in that first regex (the one with BaseServlet) but I'm not sure where to use it.
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    3. CO@scim I updated the code to print out the timestamp as well. As for you reporting that it is only printing the first occurrence, I have no idea why. If you could provide a more complete testcase (on pastebin, maybe), the I could verify correct behaviour.
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