pypt/quote-replacement.php

## quote-replacement.php
<?php

$text = 'Labas, aš "esu" Linas.';

$ws = '\s/\#~:+=&%@\-\x28\x29\]\[{}><"\'';	// whitespace
$punc = ';,\.?!';	// punctuation

$text = preg_replace("#(?<=^|[$ws])\"(?=[^$ws$punc])#", '„', $text);
$text = preg_replace("#\"#", '“', $text);

echo $text;	// Labas, aš „esu“ Linas.
	<?php

	$text = 'Labas, aš "esu" Linas.';

	$ws = '\s/\#~:+=&%@\-\x28\x29\]\[{}><"\''; // whitespace
	$punc = ';,\.?!'; // punctuation

	$text = preg_replace("#(?<=^\|[$ws])\"(?=[^$ws$punc])#", '„', $text);
	$text = preg_replace("#\"#", '“', $text);

	echo $text; // Labas, aš „esu“ Linas.