is.valid_device: Determine whether or not a given device name is valid
Description
is.valid_device determines whether or not a given
device name is valid or not according to Pushover's
specifications. It does not determine whether or not the
given device is registered to a user.
Usage
is.valid_device(device)
Arguments
device
A device name (e.g., 'phone')
Value
A boolean value indicating if the device name is valid
(TRUE) or not (FALSE)