preg_replace unknown modifier (php noob)

[kanjigirl]

I have a form that includes this snippet of code that rewrites the filename for an image to be uploaded:

 

foreach ($images as $image) {
        $sfname = preg_replace('/[^a-zA-Z]/','',$_POST['fname']);
        $new_name = $sfname[0] . '_' . preg_replace('/[^a-zA-Z]/','',$_POST['lname']) . '_' . $id . '-' . ($i + 1) . '.' . $extensions[$i];
        move_uploaded_file($_FILES[$image]['tmp_name'],$IMAGE_DIR . $new_name);
        $file = fopen($IMAGE_DIR . $new_name,"r");

 

A user keeps getting the message "Warning: preg_replace() [function.preg-replace]: Unknown modifier '4' in

/home/fcmoca/public_html/studiotour/process-entry.php on line 317"  whenever he tries to submit. His .jpg file has spaces and a hyphen in it, and I thought that might be the problem, but I tried it myself with his file and it uploaded fine for me. A typical filename would be "Cole Thompson - Two Trees in Snow.jpg."

 

I'm new to PHP and have no clue why I would be able to upload his information but he can't. Can someone help me?

[notepad]

It sounds like it might be a problem with his computer, since you can do it and he can't... Whats the link? I can test it for you too.

[effigy]

Sounds like a delimiter problem, which I don't see. Where's line 317? Are there any other regexes in the code?