删除空格和任何非字母数字的内容 [英] Removing spaces and anything that is not alphanumeric

问题描述

我正在尝试删除所有非字母数字或带有 _ 的空格:

I'm trying to remove everything that is not alphanumeric, or is a space with _:

$filename = preg_replace("([^a-zA-Z0-9]|^\s)", "_", $filename);

我在这里做错了什么，它似乎不起作用.我尝试了几种正则表达式组合......(而且我通常不是很聪明).

What am I doing wrong here, it doesn't seem to work. I've tried several regex combinations...(and I'm generally not very bright).

推荐答案

试试这个:

$filename = preg_replace("/[^a-zA-Z0-9 ]/", "_", $filename);

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