void setup(){
  
  size(400, 400);
  
  // load the xml file as a string
  String lines[] = loadStrings("http://www.nytimes.com/services/xml/rss/nyt/Weddings.xml");
  
  // join into one string
  String fileContents = join(lines, "");
  
  // create a new string using find and replace
  String newFileContents = findAndReplace(fileContents, "’", "\'");
  
  // print to window
  println(newFileContents);
  
  // save as file 
  saveFile(newFileContents, "data/newFile.txt");
  
}

String findAndReplace(String oldString, String toReplace, String replaceWith){
  
  int currentIndex = 0;
  int previousIndex = 0;
  boolean firstReplace = true;
  
  String newString = "";  //string to hold data from our request
  
  while(currentIndex != -1){
    
      // find the location of the string to replace
      currentIndex = oldString.indexOf(toReplace, previousIndex+1);


    //if not found
      if(currentIndex == -1){
        
          if(firstReplace){
        
            newString += oldString.substring(0, oldString.length());
            firstReplace = false;
          
        } else {
        
           // add from the previous index to the end
           newString += oldString.substring(previousIndex+toReplace.length(), oldString.length());
        }
        
      } else {
        
         // if found
        
        if(firstReplace){
        
            // start from beginning of string
            newString += oldString.substring(0, currentIndex);
            newString += replaceWith;  
          
            firstReplace = false;
         
         } else {
          
            // add from the previous to the location of the replace string
            newString += oldString.substring(previousIndex+toReplace.length(), currentIndex);
            newString += replaceWith;     
         }
      }
 
     previousIndex = currentIndex;
  }
  
  return newString;
}

void saveFile(String contents, String url){
   
  PrintWriter output;
 
  output = createWriter(url);
  output.println(contents);
  output.flush(); // Write the remaining data
  output.close(); // Finish the file   
}