Hi All,

I have an arbitrarily complex data structure, and I'd like to change the values in all the hashrefs in it when the corresponding key matches a certain pattern. The boring subroutine below does the trick, but I feel like there must be something existing on CPAN which I haven't been able to find, that handles things like this more generically (and cleanly/efficiently?). Can anyone point me towards such a module? Thanks 
sub change_hash_values {
    my $sub   = shift;
    my $h     = shift;
    my $match = shift;
    return unless ref($h);
    for ( ref($h) ) {
        /HASH/ and do {
            for ( keys %$h ){
                change_hash_values ( $sub, $h->{$_}, $match );
                $h->{$_} = $sub->( $h->{$_} ) if /$match/;
            }
        };
        /ARRAY/ and do {
            change_hash_values ( $sub, $_, $match ) for @$h;
        };
    }
}

my $z = {
        foo => [qw(a b c)],
        bar => [ 'a' , { changeme => 'oz' } ],
        baz => 'z'
};


change_hash_values( sub { $_[0]=~s/z/x/g; return $_[0]; },$z, qr/chang
+e/);



# Turns oz into ox

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In reply to DataStructure::RecursivelyTransform? by bduggan

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