rpartition(p1) public

Searches sep in the string from the end of the string, and returns the part before it, the sep, and the part after it. If sep is not found, returns two empty strings and str.

"hello".rpartition("l")         #=> ["hel", "l", "o"]
"hello".rpartition("x")         #=> ["", "", "hello"]
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March 19, 2014 - (v1_8_6_287 - v1_9_3_392)
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Right Partitioning Filename extension

1.9.3p392 :013 > x = “picture.2.jpg”

=> "picture.2.jpg" 

1.9.3p392 :015 > x.rpartition(‘.’)

=> ["picture.2", ".", "jpg"]