I need to validate extension of documents being uploaded in my app: doc, 
pdf, odt, ... .

Image upload has its IS_IMAGE validator, which takes "extensions" argument, 
so list of accepted extensions can be provided.

The only validator I see for non-image uploads is IS_UPLOAD_FILENAME, which 
takes "extension" argument, so only one extension can be provided. How 
come? I tried (for a test) to use tuple or list as the argument value, but 
I get such error:

*'tuple' object has no attribute 'match'*
*
*
Is there another way to validate my upload field? Or maybe I'm doing it 
wrong?

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