正则表达式记录

去掉后缀

<?php
$str = 'demo - .副本.mp3';
//$str = "小小子";
 $pattern = "/([0-9a-zA-Z_[:space:][:punct:]x{4e00}-x{9fa5}]+)./u";
//preg_match("/[x{4e00}-x{9fa5}A-Za-z0-9_]+$/u",$str, $res);
//$res = preg_replace($pattern, $str);
// $pattern = "/[x{4e00}-x{9fa5}A-Za-z0-9_[[:space:]]]+$/u";
preg_match($pattern, $str, $res);

var_dump($res);

?>

　　

$pattern = "/([0-9a-zA-Z_[:space:][:punct:]x{4e00}-x{9fa5}]+)./u";