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BSS <blah blah>
   SSID: <ssid>
   <blah blah>
BSS <and so on>

my $out = qx| sudo iw dev wlan0 scan |;
$out .= "\nBSS";
...
my @chunks = $out =~ /^(BSS.*?)(?=^BSS)/smg;

my @essids = map { /SSID: (.*?)$/ms; $1 } @chunks;