PHP正则表达式的文件名 [英] PHP Regex for filename

问题描述

我使用户可以通过文本区域更改文件名，但是现在我遇到了正则表达式问题.

I made the user possible to change file names through a textarea, but now I'm having a regex problem.

对于Windows 7，我看到文件名只不允许使用这些字符:

As I see for Windows 7, these characters only are not allowed for filenames:

\ / : * ? < > |

但是我很固执，也许也很明智，选择将正则表达式最小化为仅这些特殊字符:

But I stubbornly, perhaps also wisely, choose to minimize the regex to ONLY these special characters:

- _ .

所有其他的都应该剪掉.

All the others should have to be cut.

有人可以帮我解决这个正则表达式吗?

Can someone help me out with this regex?

preg_replace除了以下所有内容: A-Za-z0-9和- _ .

preg_replace all but: A-Za-z0-9 and - _ .

我仍然真的不了解它.

推荐答案

preg_replace('/[^A-Za-z0-9 _ .-]/', '', $filename);

[]是字符类，而^否定它.因此，它实际上与该组中的字符匹配.

The [] is a character class and the ^ negates it. So it literally matches anything other than the chars in that group.

请注意，-在末尾，因为如果在其他地方(例如， 0-9

Note that - is at the end, as it is a special range character if used elsewhere, e.g. 0-9

这篇关于PHP正则表达式的文件名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！