正则表达式匹配除字母和数字以外的所有字符 [英] Regex to match all characters except letters and numbers

问题描述

我想清除所有上传文件的文件名.我想删除除句点、字母和数字之外的所有字符.我不擅长正则表达式，所以我想我会在这里问.有人可以将我指向一个有用的站点或告诉我如何将它们组合在一起吗?我正在使用 PHP.

I want to clean the filenames of all uploaded files. I want to remove all characters except periods, letters and numbers. I'm not good with regex so I thought I would ask here. Can someone point me to a helpful site or show me how to put this together? I'm using PHP.

推荐答案

$newfilename=preg_replace('/[^a-zA-Z0-9.]/','',$filename);

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