Fixed quoted-string parsing regular expression for the "name" parameter of the Content-Disposition header (RFC 2616 section 2.2, a quoted-string can be empty)

Author: TanukiSharp

lib/incoming_form.js

@@ -353,7 +353,7 @@ IncomingForm.prototype._initMultipart = function(boundary) {
     part.headers[headerField] = headerValue;
 
     // matches either a quoted-string or a token (RFC 2616 section 19.5.1)
-    var m = headerValue.match(/\bname=("([^"]+)"|([^\(\)<>@,;:\\"\/\[\]\?=\{\}\s\t/]+))/i);
+    var m = headerValue.match(/\bname=("([^"]*)"|([^\(\)<>@,;:\\"\/\[\]\?=\{\}\s\t/]+))/i);
     if (headerField == 'content-disposition') {
       if (m) {
         part.name = m[1];