CodeWars: Split CamelCase

CodeWars: Split CamelCase.txt

ASSIGNMENT
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Split a camelcase string into individual words, the return value must be a single string of words seporated by one whitespace.
The strings are to be split on the capital letters like so:
'StringStringString' => 'String String String'
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SOLUTION
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function splitter(str){    
    return str.replace(/([a-z0-9])([A-Z])/g, '$1 $2');
} 
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-----------extra---------------
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if we want the string to be splitted on each capital letter

function splitter(str){    
    return str.match(/^[A-Z]?[^A-Z]*|[A-Z][^A-Z]*/g)
              .join(' ')                                
              .replace(/\s+/g,' '); 
} 

//if we run splitter('string StringString), .join() method will give us one extra space between 'string' and 'String': string  String String
// .replace() method will remove extra spaces