> This is a fairly primitive way to do it:
using a sliding window (safer with huge streams)
use strict;
use warnings;
use Data::Dump;
my @window;
push @window, scalar <DATA> for 1..5; # init
while (my $line = <DATA>) {
push @window, $line;
chomp @window;
if( $window[3] =~ m/[^\d]+\d+/ ){
dd \@window;
}
shift @window;
}
__END__
alpha
beta
something
a07607
b-alpha
b-beta
b-something
b-something else
c-alpha
c-beta
c-somethin
a9706
d-alpha
d-beta
d-something
d-something else
-->
["alpha", "beta", "something", "a07607", "b-alpha", "b-beta"]
["c-alpha", "c-beta", "c-somethin", "a9706", "d-alpha", "d-beta"]
Cheers Rolf
( addicted to the Perl Programming Language)
update
maybe more elegant
use strict;
use warnings;
use Data::Dump;
my @window;
while (my $line = <DATA>) {
push @window, $line;
next if @window < 6; # init
if( $window[3] =~ m/[^\d]+\d+/ ){
dd \@window;
}
shift @window;
}
Update
Oh the latter (more elegant) approach has a clear advantage, if you want to avoid overlapping results you just need to empty the window after a match and it gets automatically refilled. :)
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