How to use SED to find and replace URL strings with the “/” character in the targeted strings? [duplicate]

/ is not the delimiter in sed commands, it’s just one of the possible ones. For this example, you can for example use , instead since it does not conflict with your strings;

echo 'I think http://www.find.com/page is my favorite' | 
    sed 's,http://www.find.com/page,http://www.replace.com/page,g'