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	<title>imitatio creatio &#187; perl</title>
	<atom:link href="http://filip.rembialkowski.net/tag/perl/feed/" rel="self" type="application/rss+xml" />
	<link>http://filip.rembialkowski.net</link>
	<description>co we łbie piszczy</description>
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		<title>PL/Perl regex vs builtin regex_replace in postgres</title>
		<link>http://filip.rembialkowski.net/plperl-regex-vs-builtin-regex_replace-in-postgres/</link>
		<comments>http://filip.rembialkowski.net/plperl-regex-vs-builtin-regex_replace-in-postgres/#comments</comments>
		<pubDate>Tue, 14 Jul 2009 23:19:03 +0000</pubDate>
		<dc:creator>filip</dc:creator>
				<category><![CDATA[all]]></category>
		<category><![CDATA[databases]]></category>
		<category><![CDATA[performance]]></category>
		<category><![CDATA[perl]]></category>
		<category><![CDATA[postgres]]></category>
		<category><![CDATA[regex]]></category>

		<guid isPermaLink="false">http://filip.rembialkowski.net/?p=382</guid>
		<description><![CDATA[Maybe you (like me) wondered which one is faster... to use builtin regexp_replace function or to use Perl's regex engine via PL/Perl.
Here you are - this is a test I made (PostgreSQL 8.3.7, Perl 5.8.8, on CentOS 5,3)
First we have a plperl function:

CREATE OR REPLACE FUNCTION test_perl( TEXT ) RETURNS TEXT AS
$code$
my $str = shift;
$str [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>variable length positive lookbehind in perl regex</title>
		<link>http://filip.rembialkowski.net/variable-length-positive-lookbehind-in-perl-regex/</link>
		<comments>http://filip.rembialkowski.net/variable-length-positive-lookbehind-in-perl-regex/#comments</comments>
		<pubDate>Wed, 11 Jun 2008 17:36:45 +0000</pubDate>
		<dc:creator>filip</dc:creator>
				<category><![CDATA[all]]></category>
		<category><![CDATA[perl]]></category>
		<category><![CDATA[programming]]></category>

		<guid isPermaLink="false">http://filip.rembialkowski.net/variable-length-positive-lookbehind-in-perl-regex/</guid>
		<description><![CDATA[perlre says it does not support lookbehind matches with arbitrary length.
here is a workaround

#!perl -l -w
use strict;
#
print my $txt = 'Alice has a fish. It is a nice fish.
Bob has a dog. John has a cat.
Line 3 is not important.
Filip has a perl.
---------------------------';
#
=pod WE WANT THIS but this gives Perl error.
while ( $txt =~ m{(?]]></description>
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		<item>
		<title>explain analyze totals</title>
		<link>http://filip.rembialkowski.net/explain-analyze-totals/</link>
		<comments>http://filip.rembialkowski.net/explain-analyze-totals/#comments</comments>
		<pubDate>Fri, 21 Mar 2008 13:52:38 +0000</pubDate>
		<dc:creator>filip</dc:creator>
				<category><![CDATA[all]]></category>
		<category><![CDATA[bazy danych]]></category>
		<category><![CDATA[perl]]></category>
		<category><![CDATA[postgres]]></category>

		<guid isPermaLink="false">http://filip.rembialkowski.net/explain-analyze-totals/</guid>
		<description><![CDATA[Same as <a href="http://www.depesz.com/index.php/2007/08/06/better-explain-analyze/">depesz</a> and <a href="http://people.planetpostgresql.org/greg/index.php?/archives/106-Putting-EXPLAIN-results-into-a-table.html">Greg</a>, but using user-defined function:]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>windows/unix unicode hell</title>
		<link>http://filip.rembialkowski.net/windowsunix-unicode-hell/</link>
		<comments>http://filip.rembialkowski.net/windowsunix-unicode-hell/#comments</comments>
		<pubDate>Mon, 18 Feb 2008 13:32:06 +0000</pubDate>
		<dc:creator>filip</dc:creator>
				<category><![CDATA[all]]></category>
		<category><![CDATA[perl]]></category>
		<category><![CDATA[unix]]></category>
		<category><![CDATA[windows]]></category>

		<guid isPermaLink="false">http://filip.rembialkowski.net/windowsunix-unicode-hell/</guid>
		<description><![CDATA[Task: convert legal UTF8 into Windows native unicode (lilttle-endian, UTF-16).]]></description>
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		<slash:comments>2</slash:comments>
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