Here is one way to do it.

$string ='
some another lines
=begin
some lines
some lines
=end
some another lines...';

while ($string =~ /(?:(?:^|\n)=begin)((?:(?!\n=end).)*)\n=end/gs){
    
    print "$1\n";
    
}

output:
=======

some lines
some lines
[download]

Updated: included '\n' before =end.

---

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