I'm using an upload plugin to upload files in jquery.

This gets the type of the file uploaded (e.g. jpeg):

```
data.files[0].type

```

I need to check if it's a valid image file type (usal image file types jpeg, jpeg, gif, png) using a reg expression.

So far I have:

```
var isValid = (/\.(gif|jpg|jpeg|tiff|png)$/i).test(data.files[0].type);

```

But it's not working (always returns false).

Any ideas on how to fix?

Thanks