I have always thought redo was cool. At first glance it doesn't look anything like a goto because it is usually used with bare blocks. The code below has redo going to the start of the nearest enclosing block. 
{
    print "Enter a number 0-9\n";
    $number=<STDIN>;
    chomp($number);
    unless(length($number) == 1  && $number =~ /[0-9]/){
        print "C'mon, man! give me a number 0-9!\n";  
        redo;  
    }
}

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However, redo can take an argument (a block label) which makes it look much more goto-ish and less like elegant Perl. For example, we could redo (pun intended!) the example like this: 
GET_NUMBER:{
    print "Enter a number 0-9\n";
    $number=<STDIN>;
    chomp($number);
    unless(length($number) == 1  && $number =~ /[0-9]/){
        print "C'mon, man! give me a number 0-9!\n";  
        redo GET_NUMBER;  
    }
}

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The biggest difference between redo and a pure goto is that redo must go to an enclosing block label whereas goto goes to any label. This is still a valid redo: 
my $number;  

PROMPT_FOR_NUMBER:{
        print "Enter a number 0-9\n";
        GET_NUMBER:{
            $number=<STDIN>;
            chomp($number);
            unless(length($number) ==1  && $number =~ /[0-9]/){
                print "You don't want to give me one number ?\n";  
                redo PROMPT_FOR_NUMBER;
            }
        } 
}

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<jc> Why do people persist in asking me stupid questions?
<Petruchio> <insert mutually recursive response>
--an exchange from #perlmonks on irc.slashnet.org(2 March 2009 1345 EST)

In reply to Re^3: How many loops are there in Perl? by adamcrussell
in thread How many loops are there in Perl? by shajiindia

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