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replacing a semicolon in a string


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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");


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?

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