Comment utiliser des expressions régulières pour remplacer les caractères chinois en PHP ?

preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] ) : mixed

<?php
$string = &#39;The quick brown fox jumps over the lazy dog.&#39;;
$patterns = array();
$patterns[0] = &#39;/quick/&#39;;
$patterns[1] = &#39;/brown/&#39;;
$patterns[2] = &#39;/fox/&#39;;
$replacements = array();
$replacements[2] = &#39;bear&#39;;
$replacements[1] = &#39;black&#39;;
$replacements[0] = &#39;slow&#39;;
echo preg_replace($patterns, $replacements, $string);
?>

<?php
$string = &#39;April 15, 2003&#39;;
$pattern = &#39;/(\w+) (\d+), (\d+)/i&#39;;
$replacement = &#39;${1}1,$3&#39;;
echo preg_replace($pattern, $replacement, $string);
?>