replacing a semicolon in a string

[Smudly]

I'm having an issue with users uploading files with a Semi Colon in the file name.
I am currently using a script that replaces characters within the file name, however, when I try to add a ";" as invalid characters to replace, it is like the semi-colon just stops the script, as the file does not upload (no errors are displayed).

Here's the code I'm working with:

$valid_chars_regex = '.A-Z0-9_ !@#$%^&()+={}\[\],~`-';	
$file_name = preg_replace('/[^'.$valid_chars_regex.']|\'.+$/i', "", basename($_FILES[$upload_name]['name']));
	if (strlen($file_name) == 0 || strlen($file_name) > $MAX_FILENAME_LENGTH) {
		HandleError("Invalid file name");
		exit(0);
	}

I tried placing the semi colon all over the place in the preg_replace function, but nothing seems to work.

How can I do this?

[johanafm]

You are specifying VALID characters, not invalid ones - just like the variable name suggest: $valid_characters_regex. In the above code, the semi-colon character will allready be removed. However, you are presently allowing filenames like

#!%.(^)

When you want help to figure out why something you did doesn't work, do post what doesn't work. It's impossible to guess what you may or may not have done. The above code works perfectly, assuming you do want to allow all those strange characters in the filename.