And
    print if m{ (whatever) (?: \s+ \1){$n} \s* \Z }xms;
generalizes to any n. 

>perl -wMstrict -le
"my @lines = (
   'foo A A A', 'foo bar A B A', 'foo bar baz  A  A  A'
   );
 my $n = 3;
 $n -= 1;
 for my $line (@lines) {
   print qq{'$line'}
      if $line =~ m{ \b ([[:alpha:]]) (?: \s+ \1){$n} \s* \Z }xms;
   }
"
'foo A A A'
'foo bar baz  A  A  A'

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In reply to Re^3: ignore some delimiters while using split by AnomalousMonk
in thread ignore some delimiters while using split by nurulnad

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