> But you kinda messed up on the implementation.

Not really, you are filtering the sample input, hdb is filtering any input by a "repeating pattern".

update
  DB<10> @pat = ( 0, 1, 1, 0 );

  DB<11> x $i=0;grep { $pat[ $i++ % 4 ] } a..l;
0  'b'
1  'c'
2  'f'
3  'g'
4  'j'
5  'k'
  DB<12>

[download]

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Re^3: Grep Pattern by LanX
in thread Grep Pattern by GotToBTru

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