Re: [perl #113962] /r modifier on substitutions - variant returningundef if no match

On Tue, Jul 3, 2012 at 6:01 AM, Ed Avis <perlbug-followup@perl.org> wrote:
>
> I suggest a variant which performs the substitution and returns
> either the new string, or undef if no match.  Suppose the modifier
> /R is used for this purpose.  Then

Yes, but what if the original string was undef?  (warnings aside)  We
can't use a value to signal an exception in a function that takes a
value and returns a value.

Even if semantics could be worked out (die unless match?) I agree with
Ricardo that it's not worth another modifier.

I do think the documentation might need to reflect this issue and
perhaps add the suggestion to do it the old way if the success of the
match is important.

-- David

• [perl #113962] /r modifier on substitutions - variant returning undef if no match by Ed Avis
• Re: [perl #113962] /r modifier on substitutions - variant returningundef if no match by David Golden