What is the easiest way to remove all non-word characters of a filename?
The dot at the end before the extension is obviously needed, so all symbols like "-" or "*" or "?" should be removed except "."
Something like this:
$filename = preg_replace("/[^\.]\W/", "", $filename);
分享 I would use something like that:
$filename = preg_replace("/\W(?=.*\.[^.]*$)/", "", $filename);
The regex will match any non-word character ('word character' here is defined by the class [a-zA-Z0-9_]) from a filename as long as there's a period for the extension.
This will also take into consideration possible file names such as file.name.txt and correctly return filename.txt (the first dot not being the dot for file extension).
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