Yes, you will definitely need string eval here.

Something like this: 

#!/usr/bin/perl -w
use strict;

# builtin triggers
my %triggers;

# add triggers from params
my $trigger_name = shift @ARGV;
my $trigger_action_str = shift @ARGV;

$triggers{$trigger_name} = $trigger_action_str;

my $buff = "You are fired!";

foreach my $trigger ( keys ( %triggers ) )
{
  if ( $buff =~ /$trigger/ )
  {
    print eval '"' . $triggers{$trigger} . '\n"';
  }
}

[download]

But this is not a design anyone will recommend.

Besides, this will not run in taint mode.

In reply to Re^3: Using pattern match by akho
in thread Using pattern match by tceng

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