I'm not sure I understand exactly what you are looking for, but here's my best guess. This splits the text you provided on the word "command", retains the pattern in the results, and spans newlines. If you're looking for something else (e.g., splitting only lines containing "command"), please be more specific and we can go from there. 

use strict;
use warnings;

use Data::Dumper;

my $string = 
"command = adb
asd
  2t525
 command=adfaf
  adsgadg
asd";

my @results = split( /(?=command)/, $string );

print Dumper( \@results );

[download]
The @results array contains two elements: 
$VAR1 = [
          'command = adb
asd
  2t525
 ',
          'command=adfaf
  adsgadg
asd'
        ];

[download]
HTH

In reply to Re: split but preserve the matching pattern by bobf
in thread split but preserve the matching pattern by nwkcmk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.