Maybe this helps:

#!/usr/local/bin/perl

use strict;
use warnings;

my @ctx_starters = qw(start1 start3);

while (my $line = <DATA>) {
    if (grep { $line =~ /$_/ } @ctx_starters) {
        print $line;
      INNER:
        while ($line = <DATA>) {
            next INNER if $line !~ /^end/;
            print $line;
            last INNER;
        }
    }
    else {
        print $line;
    }
}

__DATA__
start1
foo
bar
end
start2
baz
quux
end
start3
bla
bla
end
start4
hmm
end
start5
last
one
here
end
[download]

Arjen

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