try natatime in List::MoreUtils, maybe it makes your code more elegant? ;) 

use List::MoreUtils qw/natatime/;
my @contents = <DATA>;

pop @contents;
shift @contents;
my $it = natatime 8, @contents;
    while (my @vals = $it->())
    {
        print "@vals[0,1,2] \n" if $vals[2] =~ /jack/;
    }
  

__DATA__
start
id 10 
address Richmond 
name jack 
xxxxx
aaaaa
lastname black 
yyyy
zzzzz
id 11
address Central
name rick 
cccccc
dddddd
lastname hanna
eeeee
yyyyy
id 12
address denver 
name jack
sssss
tttttt
lastname strong
rrrrr
mmmmm
id 13
address Virginia 
name mick 
aaaaaaa
ooooooo
lastname jagger
gggggg
hhhhhh
id 14 
address Maine
name rick
sssss
sssss
lastname stewart
ssssss
ffffff
end

[download]
The another advantage of this approach compared to other way is you won't lose the rest part of every chunk. you can print any elements of @vals by changing slice.


I am trying to improve my English skills, if you see a mistake please feel free to reply or /msg me a correction

In reply to Re: get n lines before or after a pattern by xiaoyafeng
in thread get n lines before or after a pattern by darklord_999

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