Remove Special Characters in NSString

Question

i am convert paragraph into words it contains many special characters like

\"  , \"  . `

how to remove this characters in nsstring and get

Answer 1

Accepted answer in SWIFT (but not SWIFTY way):

 let notAllowedCharactersSet = NSCharacterSet(charactersInString: "ABCDEFGHIJKLMNOPQRSTUVWXYZ").invertedSet
 let filtered = (stringToFilter.componentsSeparatedByCharactersInSet(notAllowedCharactersSet) as NSArray).componentsJoinedByString("")