Fun little problem. When you think patterns, think regex :) 

#!/usr/bin/perl -l

# http://perlmonks.org/?node_id=1174464

use strict;
use warnings;

my @data;
my $increasing = '';

my $previous;

while(<DATA>)
  {
  my $n = push @data, $_;
  my ($this) = (split)[1];
  $previous //= $this;
  $n > 1 and $increasing .= ($this <=> $previous) + 2;
  $previous = $this;
  }

#print "$increasing\n";

my $pos = 0;

$1 && print( @data[$pos..$pos+4]), $pos += length $&
  while $increasing =~ / ([13])\1{3}(?!\1)(?:.|$) | (.)\2* /gx;


__DATA__
10/01/2016   99.71
10/02/2016   99.53
10/03/2016   100.10
10/04/2016   100.96
10/05/2016   100.99
10/06/2016   101.38
10/07/2016   100.74
10/08/2016   100.70
10/09/2016   99.88
10/10/2016   97.62
10/11/2016   97.55
10/12/2016   99.12

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In reply to Re: Recommendations for perl modules to work on data sets ? by tybalt89
in thread Recommendations for perl modules to work on data sets ? by raghuprasad241

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