diff --git a/andor.pl b/andor.pl
index 5b4a546..edc3759 100644
--- a/andor.pl
+++ b/andor.pl
@@ -10,7 +10,7 @@
 
 
 MAIN: {
-    my @words = @ARGV;
+    my @words = @ARGV or die "No words";
 
     my @lines = <DATA>;
     chomp @lines;
@@ -25,7 +25,7 @@
         my $hl_re = join( '|', @words );
         $hl_re = qr/($hl_re)/;
 
-        _iter( $match_and_re, $hl_re, @lines );
+        _iter( $match_and_re, undef, $hl_re, @lines );
     }
 
     OR: {
@@ -37,7 +37,21 @@
         my $hl_re = join( '|', @words );
         $hl_re = qr/($hl_re)/;
 
-        _iter( $match_or_re, $hl_re, @lines );
+        _iter( $match_or_re, undef, $hl_re, @lines );
+    }
+
+    NOT: {
+        say '';
+        say "NOT";
+        my ($keep, @not) = @words;
+        my $not_re;
+        if ( @not ) {
+            $not_re = join( '|', @not );
+            $not_re = qr/$not_re/;
+        }
+        my $hl_re = qr/($keep)/;
+
+        _iter( $keep, $not_re, $hl_re, @lines );
     }
 }
 
@@ -47,16 +61,22 @@
 
 sub _iter {
     my $match_re = shift;
+    my $not_re = shift;
     my $hl_re = shift;
     my @lines = @_;
 
-    say "match=$match_re";
-    say "hlite=$hl_re";
+    say "  match=$match_re";
+    say "  notre=", ($not_re // 'undef');
+    say "  hlite=$hl_re";
 
     for ( @lines ) {
         my $line = "$_";
 
-        if ( $line =~ /$match_re/ ) {
+        my $match = $line =~ /$match_re/;
+        if ( $match && defined $not_re ) {
+            $match = $line !~ /$not_re/;
+        }
+        if ( $match ) {
             while ( $line =~ /$hl_re/g ) {
                 my $match_start = $-[0] // next;
                 my $match_end = $+[0];
@@ -86,3 +106,5 @@ sub _iter {
 sox got no
 table and apple and penny
 table only
+penny saved an apple
+penny sat at the table