It's a dereference, I'd rather (if ever) write it as 
my %hash = map  { $key++ => $_ }
           grep { $_ != 0 }
           sub {
               $line =~ /action\(([^)]+)\)/; split /,/, $1;
           }->();

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In reply to Re^3: Extract a small part of a long sentence using regular expressions by choroba
in thread Extract a small part of a long sentence using regular expressions by swatzz

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