Ruby: Split string at character, counting from the right side

Question

Short version -- How do I do Python rsplit() in ruby?

Longer version -- If I want to split a string into two parts (name, suffix) at the first \'.\' character, this

Answer 1

if this="what.to.do" you can do this:

this.split(%r{(.+)\.})

and you'll get back

["", "what.to", "do"]