I think that this is what you want. 
sub bob { print 'bob'; }

my $match = \&bob;
my $nomatch = sub { print 'nob'; };
*alias = \&bob;

for my $key (keys %main::) {
    if ($match == \&{$key}) {
        print "matched to $key\n";
    }
    if ($nomatch == \&{$key}) {
        print "matched to $key\n";
    }
}

[download]
This will match `bob' and nothing else.

This will only find subroutines in the main package.

Update: Added Alias for completness.

-- gam3
A picture is worth a thousand words, but takes 200K.

In reply to Re: Finding the name of the target of a coderef by gam3
in thread Finding the name of the target of a coderef by Forsaken

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