EXACT Ruby equivalent of Javascript's escape() function

Question

Consider the string: ` ( ?

Javascript's escape() encodes it like this:

escape("` ( ?")
"%60%20%28%20%3F"

How can I achieve the same effect in Ruby? Nothing I try works:

[Dev]> CGI.escape("` ( ?")
=> "%60+%28+%3F"
[Dev]> URI.encode("` ( ?")
=> "%60%20(%20?"
[Dev]> Addressable::URI.encode("` ( ?")
=> "%60%20(%20?"

Answer 1

ERB::Util.url_encode will do it:

>> require 'erb'
=> true
>> ERB::Util.url_encode("` ( ?")
=> "%60%20%28%20%3F"