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@ 2014-09-01T06:45:42Z

<?php
$pattern='/淸/';
$txt='淸_哈哈哈哈_我来试试';
$match = preg_match($pattern, $txt);
if ($match===false) {
    echo 'fail';
}

Output
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preg_match: documentation ( source)

preferences:dark modelive preview

37.46 ms | 402 KiB | 5 Q