#!/usr/bin/perl

use strict; # https://perlmonks.org/?node_id=11114346
use warnings;

my @array = <DATA>;

use Data::Dump 'dd'; dd \@array;

my @combinedarray = (join "", @array, '') =~ /^.*\n(?: .*\n)*/gm;

dd \@combinedarray; # do the 'for' over @combinedarray

__DATA__
keyword1 data1 data2 data3
keyword2 data1 data2 data3
    data4 data5
    data6
keyword1 data1 data2 data3 data4
keyword3 data1

##</code><code>##

[
  "keyword1 data1 data2 data3\n",
  "keyword2 data1 data2 data3\n",
  "    data4 data5\n",
  "    data6\n",
  "keyword1 data1 data2 data3 data4\n",
  "keyword3 data1\n",
]
[
  "keyword1 data1 data2 data3\n",
  "keyword2 data1 data2 data3\n    data4 data5\n    data6\n",
  "keyword1 data1 data2 data3 data4\n",
  "keyword3 data1\n",
]