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Reformatted the code and added a few comments so it looks cleaner.

use strict; use warnings; my @tmp; my @keep; while (my $a_line = <DATA>) { chomp $a_line; if ( $a_line =~ /^\d+\s+\D+/ ) { #we have a new host master record #process the data from the previous host process_previous(\@tmp); #on return @tmp may be empty @keep = (@keep, @tmp); @tmp =(); #now we empty it anyway } push @tmp, $a_line; } process_previous(\@tmp); @keep = (@keep, @tmp); @tmp=(); print "$_\n" for @keep; exit(0); #----------------- SUBS ---------------------------- sub process_previous { my $array_ref = shift; my $keep_this_data = 0; foreach my $elem(@$array_ref) { if ($elem !~ /\d:\d:\d$/ ) { #found aline NOT terminating in 3 digit, each separated by + a #colon, so we want to keep the whole info abou this host $keep_this_data = 1; last; } } if (!$keep_this_data) { #empty the array @$array_ref = (); } } __DATA__ 7 hostname12 Generic-legacy 10000000AB210ACF6 --- 10000000AB210ACF4 2:5:4 9 hostname13 Generic 10000000AB2A3006A 3:5:2 10000000AB2A30068 2:5:2 23 srvernam Generic-legacy 5001438002A3004A 3:3:3 5001438002A3004A --- 5001438002A30048 2:3:3 5001438002A30048 2:5:2 5001438002A30048 2:5:2 9 hostname13 Generic 10000000AB2A3006A 3:5:2 10000000AB2A30068 2:5:2 21 HOSTNAME Generic 9 hostname13 Generic 10000000AB2A3006A 3:5:2 10000000AB2A30068 2:5:2

In reply to Re: Regex to extract certain lines only from command output/text file. by arnaud99
in thread Regex to extract certain lines only from command output/text file. by perl514

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