Defining re pattern for matching list of numbers

[jorma kala]

Hi,
I'm trying to write a re pattern to match a list of one or more numbers,
each number is in the range of 1-15 value and the numbers are separated by
spaces (but there are no spaces at the beginning and end of the string). For
instance:

"3"
"1 14 8"

but not:

"22"
" 5 11"

I've come up with something like this

re.compile("^((([1-9])|(1[0-8]))( +(?=[1-9]))*)+$")

but I can't believe this has to be so complicated.
Does anyone know some simpler re pattern to match this kind of string
Many thanks
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