Issue with \r\n and \t

[eluser]dbashyal[/eluser]

Code:

$newline = preg_replace('/\r\n/', "\r\n", $newline);
or,
$newline = preg_replace('/(\r|\n)/', "\r\n", $newline);

$newline = preg_replace('/\t/', "\t", $newline);

replaces every repeat.