A subroutine inspired by the responses from naikonta and pgor but greping using exists against an on-the-fly hash constructed from the elements of @$raAll.

sub isTargetInAll
{
    my ($raAll, $raTarget) = @_;
    return
       @$raTarget
       ==
       grep
       {
           exists { map { $_ => 1 } @$raAll }->{$_}
       }
       @$raTarget;
}

[download]

I think that should be reliable as long as @$raTarget doesn't contain duplicates; if you were looking for a Sun and two Moons you would get a false positive if @$raAll had a Sun and just one Moon.

Cheers,

JohnGG

In reply to Re: using grep to match more than two words by johngg
in thread using grep to match more than two words by sroy5

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