如何从字符串中删除扩展名(仅实际扩展名！) [英] How to remove extension from string (only real extension!)

问题描述

我正在寻找一个小的功能，该功能允许我从文件名中删除扩展名.

I'm looking for a small function that allows me to remove the extension from a filename.

我通过谷歌搜索找到了许多示例，但是它们很糟糕，因为它们只是用."删除了字符串的一部分. .他们使用点作为限制器，只是剪切字符串.

I've found many examples by googling, but they are bad, because they just remove part of the string with "." . They use dot for limiter and just cut string.

看看这些脚本，

$from = preg_replace('/\.[^.]+$/','',$from);

或

 $from=substr($from, 0, (strlen ($from)) - (strlen (strrchr($filename,'.'))));

当我们添加这样的字符串时:

When we add the string like this:

这是字符串的例子

This.is example of somestring

它将仅返回"This" ...

It will return only "This"...

扩展名可以包含3个或4个字符，因此我们必须检查点是否位于4或5个位置，然后将其删除.

The extension can have 3 or 4 characters, so we have to check if dot is on 4 or 5 position, and then remove it.

怎么办?

推荐答案

尝试以下方法:

$withoutExt = preg_replace('/\\.[^.\\s]{3,4}$/', '', $filename);

因此，它匹配一个点，后跟三个或四个不是点或空格的字符.应该放宽"3或4"规则，因为有很多文件扩展名短些或长一些.

So, this matches a dot followed by three or four characters which are not a dot or a space. The "3 or 4" rule should probably be relaxed, since there are plenty of file extensions which are shorter or longer.

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