G'day perlance,

Reading the entire file contents into a string, and then reading all of that data again to parse it, is not very efficent: instead, parse the data as you're reading it (once). I also think you're completely on the wrong track with '... split(/($pattern)/ ...'; to be honest, I'm not really sure what you were hoping to achieve with that.

All you probably need is something simple like this: 

#!/usr/bin/env perl

use strict;
use warnings;

my $chunk = -1;

while (<DATA>) {
    if ((split)[1] eq 'False') {
        ++$chunk;
        print "#Chunk $chunk:\n";
    }

    print;
}

__DATA__
GO:0002366   False
GO:0002446   True
GO:0002275   True
GO:0043312   True
GO:0006733   False
GO:0019674   False
GO:0043588   False
GO:0055065   False
GO:0055080   True

[download]

Output:

#Chunk 0:
GO:0002366       False
GO:0002446       True
GO:0002275       True
GO:0043312       True
#Chunk 1:
GO:0006733       False
#Chunk 2:
GO:0019674       False
#Chunk 3:
GO:0043588       False
#Chunk 4:
GO:0055065       False
GO:0055080       True

[download]

— Ken

In reply to Re: Parsing block of texts by kcott
in thread Parsing block of texts by perlance

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.