Re: Print specific data based on regex search in previous line

[Athanasius]

Hello Eshan_k,

Here’s a straightforward approach using two variables to keep track of which plane and filter type we are “in” at any given input line:

use strict;
use warnings;

my  $prefix = qr/ ^ \s* \w{3} > \s+ /x;
my ($plane, $filter);

while (my $line = <DATA>)
{
    if ($line =~ / $prefix LR_PLANE_(\w+), /x)
    {
        $plane  = $1;
        $filter = undef;
        print "\n$line";
    }
    elsif ($plane)
    {
        if ($line =~ / $prefix LR_FILTER_TYPE: \s+ RESTORE_(\w+) /x)
        {
            $filter = $1;
            print $line;
        }
        elsif ($filter && $line =~ / $prefix $filter _ [VH] FILTER_ \d
+: /x)
        {
            print $line;
        }
    }
}

__DATA__
   ABC> LR_PLANE_Y, LRU_SIZE: 128X128, LRU_X: 0, LRU_Y: 0,
   ABC> Dif: 744374271, Rng: 51464, Cnt: 4, Ret: 1
   ABC> LR_FILTER_TYPE: RESTORE_WIENER
   ABC> Literal: 0 
   ABC> Literal: 11
   ABC> Literal: 14
   ABC> Literal: 0
   ABC> Literal: 12
   ABC> Literal: 3
   ABC> WIENER_VFILTER_0: 5, WIENER_VFILTER_1: -19, WIENER_VFILTER_2: 
+30
   ABC> WIENER_HFILTER_0: 5, WIENER_HFILTER_1: -20, WIENER_HFILTER_2: 
+9
   ABC> LR_PLANE_U, LRU_SIZE: 128X128, LRU_X: 0, LRU_Y: 0, 
   ABC> Dif: 525860863, Rng: 38897, Cnt: 0, Ret: 1
   ABC> LR_FILTER_TYPE: RESTORE_WIENER
   ABC> Literal: 2 
   ABC> Literal: 6
   ABC> Literal: 9
   ABC> Literal: 7
   ABC> WIENER_VFILTER_0: 0, WIENER_VFILTER_1: -2, WIENER_VFILTER_2: 2
+2
   ABC> WIENER_HFILTER_0: 0, WIENER_HFILTER_1: 2, WIENER_HFILTER_2: 11
   ABC> LR_PLANE_V, LRU_SIZE: 128X128, LRU_X: 0, LRU_Y: 0, 
   ABC> Dif: 66698751, Rng: 59048, Cnt: 9, Ret: 1
   ABC> LR_FILTER_TYPE: RESTORE_WIENER
   ABC> Literal: 14
   ABC> Literal: 4
   ABC> Literal: 3
   ABC> Literal: 5
   ABC> WIENER_VFILTER_0: 0, WIENER_VFILTER_1: -22, WIENER_VFILTER_2: 
+25
   ABC> WIENER_HFILTER_0: 0, WIENER_HFILTER_1: -13, WIENER_HFILTER_2: 
+12

Output:

13:37 >perl 1886_SoPW.pl

   ABC> LR_PLANE_Y, LRU_SIZE: 128X128, LRU_X: 0, LRU_Y: 0,
   ABC> LR_FILTER_TYPE: RESTORE_WIENER
   ABC> WIENER_VFILTER_0: 5, WIENER_VFILTER_1: -19, WIENER_VFILTER_2: 
+30
   ABC> WIENER_HFILTER_0: 5, WIENER_HFILTER_1: -20, WIENER_HFILTER_2: 
+9

   ABC> LR_PLANE_U, LRU_SIZE: 128X128, LRU_X: 0, LRU_Y: 0,
   ABC> LR_FILTER_TYPE: RESTORE_WIENER
   ABC> WIENER_VFILTER_0: 0, WIENER_VFILTER_1: -2, WIENER_VFILTER_2: 2
+2
   ABC> WIENER_HFILTER_0: 0, WIENER_HFILTER_1: 2, WIENER_HFILTER_2: 11

   ABC> LR_PLANE_V, LRU_SIZE: 128X128, LRU_X: 0, LRU_Y: 0,
   ABC> LR_FILTER_TYPE: RESTORE_WIENER
   ABC> WIENER_VFILTER_0: 0, WIENER_VFILTER_1: -22, WIENER_VFILTER_2: 
+25
   ABC> WIENER_HFILTER_0: 0, WIENER_HFILTER_1: -13, WIENER_HFILTER_2: 
+12

13:37 >

Hope that helps,

[Eshan_k]

Thank you so much Athanasius for your suggestion. The solution worked for me.