Chomp removes the current "input record separator", which can be changed by editing one of the built-in perl variables:

$/ = "\r\n";
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Or you can just use regex to convert the line endings, which is probably safer if you don't know for sure what they're going to be:

for ("\r", "\n", "\r\n", "\n\r", "\r\r", "\n\n") {
    $line = 'text'.$_."text";
    $line =~ s/$1/\n/g if m/(\r\n?|\n\r?)/;
    print "$line\n";
}
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This basically detects what the line endings are from the first line ending, then converts everything to a standard \n.