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$var = 'this is a string\twith some text\r\n';
$var =~ s/\\t/\t/;
$var =~ s/\\r/\r/;
$var =~ s/\\n/\n/;

 
$var = 'this is a string\twith some\x09text\r\n';

$var =~ s/\\x09/\x09/;