escaping - Ruby gsub doesn't escape single-quotes

Question

I don't understand what is going on here. How should I feed gsub to get the string "Yaho'o"?

>> "Yaho'o".gsub("Y", "\Y")
=> "\Yaho'o"
>> "Yaho'o".gsub("'", "\'")
=> "Yahooo"

Answer 1

' means $' which is everything after the match. Escape the again and it works

"Yaho'o".gsub("'", "\\'")