Remember, you can return a list of any size from map's block:

my @results = map { m/good stuff/ ? do { ... } : () } @array;
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So return an empty list to produce a no-op in map's output. If you don't want the whole thing wrapped in a conditional like this, you can also use return () somewhere in the block as a guard condition in place of next, but you have to mess with the syntax a little:

my @results = map sub { return () unless m/good stuff/; ... }, @array;
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Note the sub keyword, and the comma after the sub. All in all, it's probably clearest to tack on a grep before the map:

my @results = map { ... } grep { m/good stuff/ } @array;
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