PHP preg_match, need some help

Question

Can someone please help me with this preg_match

if (preg_match('~[^A-Za-z0-9_\./\]~', $filepath))
    // Show Error message.

I need to match a possible filepath. So I need to check for double slashes, etc. Valid file path strings should look like this only:

mydir/aFile.php

or

mydir/another_dir/anyfile.js

So a slash at the beginning of this string should be checked also. Please help.

Thanks :)

EDIT: Also, guys, this path is being read from within a text file. It is not a filepath on the system. So hopefully it should be able to support all systems in this case.

RE-EDIT: Sorry, but the string can also look like this too: myfile.php, or myfile.js, or myfile.anything

How do I allow strings like this as well?? I apologize for not being too specific on this before...

Answer 1

You can do:

if(preg_match('#^(\w+/){1,2}\w+\.\w+$#',$path)) {
        // valid path.
}else{
        // invalid path
}