If you are reading $group from a file, you can probably replace the exclamation marks when reading the file already. Something like
{   local $/ = '!';
    while (<>) {
        chomp;
        print "$_\n";
        last if 50_000 <= $.;
    }
}
print <>;

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In reply to Re: Fast Replacement by choroba
in thread Fast Replacement by sathishselvam

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