ruby - How do I split a string on capitals unless preceded by a '+' -

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I have a simulated string, which I would like to split capitals on different words, until one capital Do not be the first '+':

Partitioning in Ruby is quite simple: s.split (/ (? = [AZ]) /) But I do not know how For example: 

  s = "FooBashFizz + BuzzXBar" p s.split (/ (? = [AZ]]) /) =) & gt; ["Foo", "Bash", "Fizz +", "Buzz", "X", "Bar"]   
 Desired:  
  = & Gt; ["Foo", "Bash", "Fuzz + Buzz", "X", "Bar"]    
 
 
 Add a negative attitude in the beginning.  
  irb (main): 001: 0> S = "FooBashFizz + BuzzXBar" = & gt; "Foobhphis + BuzzExber" IRB (Main): 002: 0> S.split (/ (? & Lt !! \ +) (? = [A-Zed]) /) = & gt;    Explanation:   
     
  •   (? & Lt ;! \ +)  indicates that the predecessor It will also be, but there will be no  +  symbol.  
  •   (? = [AZ])  emphasizes that the lower letter should be an uppercase letter.

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