Regex to match odd numbers

[Abigail]

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 using more than two digits, ending in an
odd one? That doesn't seem to be hard to write.


/^0*(?:7|9|[1-9][0-9]*[13579])$/



Abigail