It ain't pretty, but using the sexeger (reverse regex) technique, which can no doubt be implemented better, this works.
It requires you start with your lines in an unchomped array rather than a single line though.
my @g=<DATA>;
my $id = 'key3';
my $g = join'',reverse @g;
if (my ($ret) = $g =~ m/^$id=.*?\n(.*?)\n\n/s) {
$ret = join$/,reverse split$/,$ret;
print $ret;
} else {
print 'Failed!'.$/;
}
__DATA__
## START
# comment 1
# 2
# 3
# 4
key1=val1
# info a
# b
# c
# d
# e
key2=val2
# comment !
# @
# #
key3=val3
Cor! Like yer ring! ... HALO dammit! ... 'Ave it yer way! Hal-lo, Mister la-de-da. ... Like yer ring!
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