Mirth Batch Split.js

// Mirth JS Split
var line;
var message = '';
while (line = reader.readLine()) {
	message += line + '\r\n'; // 1 to N

	try {
		reader.mark(1); //Looks ahead 
		var nextline = reader.readLine();
		if(nextline==null) break;
		reader.reset();

		if (nextline.indexOf("TAG")==0) {
			break;
		}
	} finally {
		//reader.reset();
	}
}
return message;