2009/3/11 kevin liu <[email protected]>:
> �...@array = qx{ps -ef | grep hald-runner};
> chomp @array;
> foreach ( @array ) {
> if (/grep hald-runner/) {
> next;
> }
> }
>
> Here my confusion comes: What the grep here will mean??
> Here "grep" is just a plain text or a verb which can help to grep
> contents??
The former. For a part of a regex (or string) to be interpolated (i.e.
regarded as perl syntax rather than string), it should be identifiable
as a variable:
use strict;
use warnings;
my $foo = "blep and grep and snep"; #no interpolation
my $bar = "grep and"; #same
my $baz = "mep and $bar dep"; #$bar identified as variable, interpolated
if ($foo =~ /grep/){ print "'grep' in '$foo'\n";} #not interpolated
if ($foo =~ /$bar/){ print "'$bar' in '$foo'\n";} #interpolated
if ($baz =~ /grep/){ print "'grep' in '$baz'\n";} #not interpolated,
but $baz include interpolated variable $bar
--
Erez
It's time to grow out of the browser; we have nothing to lose but our metaphors.
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