jjkk73 at gmail
Nov 6, 2009, 11:12 AM
Post #3 of 4
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Re: Defining re pattern for matching list of numbers
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Thanks for your reply.
But I need to use a regex; my program deals with a large number of
patterns, and I want to treat them in a uniform way (through regex).
On 11/6/09, Chris Rebert <clp2 [at] rebertia> wrote:
>
> On Fri, Nov 6, 2009 at 8:04 AM, jorma kala <jjkk73 [at] gmail> wrote:
> > 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.
>
>
> Your format seems so simple I have to ask why you're using regexes in
> the first place.
>
> try:
> nums = [int(num) for num in line.split(" ")]
> except ValueError:
> print "Invalid input"
>
> for num in nums:
> if num < 1 or num > 15:
> raise ValueError, "Number present which is outside of valid range"
>
> Cheers,
> Chris
>
> --
> http://blog.rebertia.com
>
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