The scalar context range operator (flip flop) can be powerful fu:

use strict;
use warnings;

my $match = 'lvol[35]';

while (<DATA>) {
    next if ! (my $it = /^LV Name/ .. /^LV Name/ && ! /$match/);
    
    if ($it =~ /E0/) {
        print "---\n";
        next;
    }
    
    print "$it: $_";
}

__DATA__
--- Logical volumes ---
LV Name                     /dev/vg00/lvol3
VG Name                     /dev/vg00
Various stuff omitted
LV Name                     /dev/vg00/lvol4
VG Name                     /dev/vg00
Various stuff omitted
LV Name                     /dev/vg00/lvol5
VG Name                     /dev/vg00
Various stuff omitted
LV Name                     /dev/vg00/lvol6
VG Name                     /dev/vg00
Various stuff omitted

[download]

Prints:

1: LV Name                     /dev/vg00/lvol3
2: VG Name                     /dev/vg00
3: Various stuff omitted
---
1: LV Name                     /dev/vg00/lvol5
2: VG Name                     /dev/vg00
3: Various stuff omitted
---

[download]

If you are unfamiliar with it take a look at Flipin good, or a total flop?.

DWIM is Perl's answer to Gödel

In reply to Re: Getting only part of a text file... by GrandFather
in thread Getting only part of a text file... by svnipp

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.