I have a file with a text field that could contain characters the sed sees as special characters.

I need to be able to replace this text with other text, however if I use sed like:

sed 's/oldtext/newtext/g'

It errors stating garbled (something or other), which I am putting down to the fact it is reading the text literally and think the likes of / etc should be treated as special chars.

Is there a way around this so I can get it to ignore what it thinks are special chars? (just see the text - Wow *?/ woopee do /$)

By the way thats not the text I want to add