[Python] File uploading in flask and showing error message

I'm implementing an application to process GPS data. In the application users can upload files and those files will be processed in server.

I need to validate the user uploaded file extension. But the problem is extensions can be change.

.17o, .11o, .12o, .13o, .14o, .15o, .23o, .54o


common patterns are

.*o, .*n, .*obs, .*nav, .nav, .obs


* is always a 2 Digit number

This is what I have tried

ALLOWED_EXTENSIONS = set(["*+'n'" , "*+'o'"])


How can I change the ALLOWED_EXTENSIONS to accept above mentioned common patterns.

I have used flask documentation for the upload file reference

I think I have to change this functions

def allowed_file(filename):
return '.' in filename and \
filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

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