Print specific data based on regex search in previous line

Eshan_k has asked for the wisdom of the Perl Monks concerning the following question:

Hello Monks,

I am a seeker of perl wisdom :) Can anyone help on this ? I have following input text:

   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
[download]

I am doing regex match and detecting this info: LR_PLANE_Y As soon as I detect this I want to print

   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
[download]

Like this for: LR_PLANE_U This is info:

   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
[download]

and for :LR_PLANE_V This is info:

   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
[download]

How can I associate this next filter information, and filter type after detecting a plane? so far I am setting a flag after I detect the plane :

Currently after detecting plane it prints out filter info for all lines.How to make sure first encountered filter info belongs to previously detected plane ?

if ($line =~ /\s*AED>\sLR_PLANE_Y/i){
         $y_filter_flag = 1;
        if ($line =~ /\s*AED>\sLR_FILTER_TYPE:\s(\w+)/i){ #Lr_params_Y
+0
                                if ($1 eq "RESTORE_WINNER")   {$y_filt
+er_type="01";}

          }

if ($line =~ /\s*WIENER_VFILTER_0:\s(-?\d+),\sWIENER_VFILTER_1:\s(-?\d
++),\sWIENER_VFILTER_2:\s(-?\d+)/i){
  ##doing dome manupulation
}
[download]

Currently after detecting plane it prints out filter info for all lines.How to make sure first encountered filter info belongs to previously detected plane ?

Comment on Print specific data based on regex search in previous line Select or Download Code

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Re: Print specific data based on regex search in previous line
by Athanasius (Archbishop) on May 08, 2018 at 03:38 UTC

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
[download]

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 >
[download]

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

[reply]
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Re^2: Print specific data based on regex search in previous line

by Eshan_k (Acolyte) on Jun 01, 2018 at 04:39 UTC

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

[reply]

Re: Print specific data based on regex search in previous line
by NetWallah (Canon) on May 08, 2018 at 05:28 UTC

perl -n  -E 'BEGIN{ $/=" LR_PLANE"}; m/FILTER/ and print "$_\n" for sp
+lit "\n";print "\n"' Your_file.txt
[download]

Memory fault -- brain fried

[reply]
[d/l]

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