Re: [FWP] IP address regex golf

[Ronald J Kimball <rjk@linguist.dartmouth.edu>]

On Sat, Apr 29, 2000 at 01:30:18PM -0400, Jeff Pinyan wrote:
> On Apr 29, blm@halcyon.com said:
> 
> >The difference is that false and "" are indistinguishable here, but false
> >and 0 aren't.
> 
> Ah ha.  Bah. :)  Why doesn't Perl return 0 for false in logic cases like
> this?  That often boggles me.

Perl does return 0 for false.  But, Perl also returns "" for false.

As you know, a Perl scalar can have both a string value and a numeric
value.  False is a predefined scalar whose string value is "" and numeric
value is 0.  In a string context you get "", and in a numeric context you
get 0.

(The numeric value is an integer; scalars also have a floating point
value.)

Ronald

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