Re: Removing matched pattern except the first pattern

Hi rahulruns,

If I understand your posted title and question well Removing matched pattern except the first pattern :
you wanted to match and remove the following

procs -----------memory---------- ---swap-- -----io---- --system-- ---
+--cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us s
+y id wa st
[download]

which occur once and again in your data, EXCEPT for the first occurrence of them.
If that is correct, you might do like so:

use warnings;
use strict;

my $flag            = 0;
my $matched_control = qr/^\s+?\d/;

while (<DATA>) {
    chomp;
    ++$flag if !/$matched_control/;
    if ( $flag > 2 ) {
        next if !/$matched_control/;
    }
    print $_, $/;
}

__DATA__
procs -----------memory---------- ---swap-- -----io---- --system-- ---
+--cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us s
+y id wa st
 0  0      0 50101200 234628 9636240    0    0     0    34 10782 6802 
+ 1  1 98  0  0
 1  0      0 50102044 234628 9636276    0    0     0    96 8630 6980  
+1  1 98  0  0
 1  0      0 50113020 234628 9626112    0    0     0  3092 13393 10324
+  3  1 96  0  0
 1  0      0 50111244 234628 9628188    0    0     0  1540 10106 8874 
+ 2  1 97  0  0
 0  0      0 50111256 234628 9628228    0    0     0     0 8674 6961  
+1  1 98  0  0
 0  0      0 50109884 234628 9628228    0    0     0   280 11290 7593 
+ 1  1 97  0  0
 0  0      0 50110672 234628 9628264    0    0     0    16 8886 7301  
+1  1 98  0  0
 1  0      0 50110708 234628 9628268    0    0     0    40 11285 6833 
+ 1  1 98  0  0
procs -----------memory---------- ---swap-- -----io---- --system-- ---
+--cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us s
+y id wa st
 0  0      0 50101200 234628 9636240    0    0     0    34 10782 6802 
+ 1  1 98  0  0
 1  0      0 50102044 234628 9636276    0    0     0    96 8630 6980  
+1  1 98  0  0
 1  0      0 50113020 234628 9626112    0    0     0  3092 13393 10324
+  3  1 96  0  0
 1  0      0 50111244 234628 9628188    0    0     0  1540 10106 8874 
+ 2  1 97  0  0
 0  0      0 50111256 234628 9628228    0    0     0     0 8674 6961  
+1  1 98  0  0
procs -----------memory---------- ---swap-- -----io---- --system-- ---
+--cpu-----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us s
+y id wa st
 0  0      0 50111256 234628 9628228    0    0     0     0 8674 6961  
+1  1 98  0  0
 0  0      0 50109884 234628 9628228    0    0     0   280 11290 7593 
+ 1  1 97  0  0
 0  0      0 50110672 234628 9628264    0    0     0    16 8886 7301  
+1  1 98  0  0
 1  0      0 50110708 234628 9628268    0    0     0    40 11285 6833 
+ 1  1 98  0  0
[download]

Please, note that I have modified the OP data shown, to illustrate my point.

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

Comment on Re: Removing matched pattern except the first pattern Select or Download Code

Replies are listed 'Best First'.
Re^2: Removing matched pattern except the first pattern by rahulruns (Scribe) on May 29, 2013 at 04:11 UTC
2teez: It is deleting all the lines with procs -----------memory---------- ---swap-- -----io---- --system-- but leaving all the lines with r b swpd free buff cache si so bi bo in I need to keep the first two lines procs -----------memory---------- ---swap-- -----io---- --system-- --- +--cpu----- r b swpd free buff cache si so bi bo in cs us s +y id wa st and delete any further occurence of these lines	[reply]
Re^3: Removing matched pattern except the first pattern by 2teez (Vicar) on May 29, 2013 at 04:35 UTC
rahulruns, It is deleting all the lines with procs... WHICH?, your actual code or the codes I presented in Re: Removing matched pattern except the first pattern. Maybe, you need to check your data and how you implemented the code given. The output of the code presented perviously is: Read more... (3 kB) Please, try it yourself TIY. If you tell me, I'll forget. If you show me, I'll remember. if you involve me, I'll understand. --- Author unknown to me	[reply] [d/l]