>From http://perldoc.perl.org/perlreref.html -
p Preserve a copy of the matched string -
${^PREMATCH}, ${^MATCH}, ${^POSTMATCH} will be defined.
fishbookAirMobile:~ fishman$ echo alphabet | perl -e '$_=<STDIN>; if
(m/pha/p){print ${^PREMATCH}, "\n"}'
al
On Tue, Feb 2, 2016 at 8:59 PM, Jonathan Levi via macperl <macperl@perl.org>
wrote:
> Can someone explain why the following:
>
> echo alphabet | perl -e '$_=<STDIN>; if (m/pha/){print $PREMATCH, "\n"}'
>
> yields "" instead of "al", as I expected?
>
> Jonathan
>
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Matthew Fischer
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