Regex to match odd numbers

Abigail abigail at
Tue May 27 17:04:03 BST 2014

On Tue, May 27, 2014 at 04:22:07PM +0100, David Cantrell wrote:
> As part of the nasty mess that is CPANdeps, I have this line of code:
> $record->{is_dev_perl} = (
>   $record->{perl} =~ /(^5\.(7|9|11|13|15|17|19|21)|rc|patch)/i
> ) ? 1 : 0;
> I'd like to not have to remember to add 23 to the list in a year or so's
> time. Can anyone think of a nice way of matching any odd number from 7
> upwards?  Obviously it's easy to do in a coupla lines of perl code
> instead of a regex, so I'm asking more out of curiosity than because I
> actually need it.

You mean, 7, 9, or any number that requires at least two digits where
the last one is odd?

I'd write that as:


allowing for leading 0s.


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