I've just downloaded Rakudo, and changing my Perl5 code into Perl6, but I've encountered some difficulties:

1. print '218' =~ s/^18/3/r

2. $_ = '2316'; substr($_, -1, 1) = 8; print

3. map {$s+=int $_*($i=abs int 999/$_)*++$i/2 },(3,5,-15);print $s

4. 

LOOP:
        say q/Please input a number (>1):/;
        while(<>){
                chomp;

                say $_;
                goto LOOP;
        }

[download]

How to make the above four scripts work in Perl6?

In reply to How to change these small one-liners into Perl6 code? by ABCXYZ

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