Sewi:

That's nifty:

$ cat string_obj.pl
#!/usr/bin/perl
use strict;
use warnings;

my %vars = qw(bar shizzle baz diddle foo voodoo );
print "vars: ",
      join(", ", map { "!$_=>'$vars{$_}'" } sort keys %vars),
      "\n\n";

my $template = '!foo bar !baz';
my $object = bless \$template, 'TemplateStr';
print "template='$template'\n";

my $str = $object->doit(%vars);
print "str='$str'\n\n";

$template = 'foo !bar baz';
print "template='$template'\n";

$str = $object->doit(%vars);
print "str='$str'\n\n";

package TemplateStr;

sub doit {
    my ($self, %v) = @_;
    my $rv = $$self;
    for my $k (keys %v) {
        $rv =~ s/!$k/$v{$k}/g;
    }
    return $rv;
}

$ ./string_obj.pl
vars: !bar=>'shizzle', !baz=>'diddle', !foo=>'voodoo'

template='!foo bar !baz'
str='voodoo bar diddle'

template='foo !bar baz'
str='foo shizzle baz'
[download]

...roboticus

When your only tool is a hammer, all problems look like your thumb.