code: function readFile(inPath, useHeader, regex) {
  
  	var index = 0;
  	var outData = [];
  
  	var readStream = fs.createReadStream(inPath)
  		.pipe(split())
  		.on('data', function (line) {
  
  			line = line.toString().match(regex);
  
  			if(line){
  
  				if(useHeader && index == 0){
  					setHeaderRowAsKeys(line);
  				}
  				else if(useHeader) {
  					// create an object with header row keys
  					line = addKeys(line);
  					outData.push(line);
  				}
  				else {
  					// array, no keys
  					outData.push(line);
  				}
  
  				index++;
  			}
  		});
  
  	readStream.on('end', function () {
  		writeFile(outData, yargs.o);
  	});
  }
docs: /[^\t]+/g