One approach is to use a regular expression:
#!/usr/bin/perl
use common::sense;
my $data = join('', <DATA>);
$data =~ s{(^|\n)begin\n # begin at start of string or line
(.*?\n)*? # lines to skip (non-greedy)
end\n} # matching end
{$1begin\nend\n}sx;
print $data;
__DATA__
a
begin
1
a
2
end
c
begin
c
end
a
begin
1
Update: added \n anchors and commented the regexp.
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