use strict;
use warnings 'all';
 
use Benchmark 'cmpthese';

$::a = "foo-bar";
cmpthese -5 => {
    sub  =>  sub {$::a =~ /([-])/},
    str  =>      '$::a =~ /([-])/',
};
__END__
Benchmark: running str, sub for at least 5 CPU seconds...
       str:  5 wallclock secs ( 5.34 usr +  0.00 sys =  5.34 CPU) @ 390154.68/s (n=2083426)
       sub:  5 wallclock secs ( 5.13 usr +  0.00 sys =  5.13 CPU) @ 282139.18/s (n=1447374)
        Rate  sub  str
sub 282139/s   -- -28%
str 390155/s  38%   --

##</code><code>##

    my ($subcode, $subref);
    if (ref $c eq 'CODE') {
        $subcode = "sub { for (1 .. $n) { local \$_; package $pack; &\$c; } }";
        $subref  = eval $subcode;
    }
    else {
        $subcode = "sub { for (1 .. $n) { local \$_; package $pack; $c;} }";
        $subref  = _doeval($subcode);
    }

##</code><code>##

my $opts='-5 \\\\\\\\foo\\\\bar\\\\baz.exe';

##</code><code>##

my $opts=q!-5 '\\\\foo\\bar\\baz.exe'!;