how to represent specail characters in sed?

[Song Jianping]

hello,
I know sed command "s/regular expression/replacement" can replace
certain regular expression with replacement text. Now I  want replace
backspace('\b') with some other chars, what can i do? I have tried
putting "\\b" or "\010" in regular expression, but it doesn't seem to
work. Is there any method to do this?
Thanks.