I wonder...
At least for 3.6.0 in /includes/class_bbcode.php find:
Code:
$text = preg_replace('/(?<!&|"|<|>|©|&#[0-9]{1}|&#[0-9]{2}|&#[0-9]{3}|&#[0-9]{4}|&#[0-9]{5})' . preg_quote($find, '/') . '/s', $replace, $text);
And replace it with:
Code:
$text = preg_replace('/(?<!&|"|<|>|©|&#[0-9]{1}|&#[0-9]{2}|&#[0-9]{3}|&#[0-9]{4}|&#[0-9]{5})' . preg_quote($find, '/') . '/is', $replace, $text);
I haven't tested it.