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

##</code><code>##

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
---