regex - Ruby: Delete space after every comma? -

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What will be the ruby ​​code to delete the white space after each comma in the string? I'm not sure why this works. 

  .gsub (/ [,] /, ',')    
 
 
  "hello, world" .gub (/, /, ',')   
  []  is used to match any of the contained characters. You are changing each comma or space with a comma.

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