JS: Extracting Parts from a String (Paragraph) on variable length

var input = "Booking:\n2 people\n\nUser Details:\nFirstname Lastname\n123456789\n\nfacebook.com/username\n\nExtras:\nService1\nService2\n\nPricing:\n$1500/-\n\nComments:\nLorem ipsum\n\ndolor sit amet";

// the input string is split into seperate lines and stored in array "lines":

var lines = input.split("\n");

// lines[0]="Booking:", lines[1]="2 people", lines[2]="", lines[3]="User Details" ...

// The lines are split per section, and stored in 2D-array "result":
// With expect=0 we look for sections[0], which is "Bookings".
// If the line "Bookings:" is found, "expect" is incremented to 1, so that
// we're now looking for sections[1], which is "User Details", and so on...
// If a line is found that is not the expected section title, and it's not empty,
// we add the line to the current section with push().

var sections = ["Booking", "User Details", "Extras", "Pricing", "Comments"];
var expect = 0, result = [];

for (var i = 0; i < lines.length; i++) {
    if (lines[i] == sections[expect] + ":") result[expect++] = []
    else if (result.length && lines[i] != "") result[result.length - 1].push(lines[i]);
}

// result[0][0]="2 people" (first line under "Booking")
// result[1][0]="Firstname Lastname" (first line under "User Details")
// result[1][1]="123456789" (second line under "User Details")
// result[1][2]="facebook.com/username" (second line under "User Details")
// ...
// result[4][0]="Lorem ipsum" (first line under "Comments")
// result[4][1]="dolor sit amet" (third line under "Comments", empty line is skipped)

// If all 5 sections have been found, we extract the variables:

var people, name, phone = "", email = "", fbook = "", extras = "", price, comments = "";

if (result.length == 5)
{

// people = the integer number at the beginning of the 1st line of the 1st section:

    people = parseInt(result[0].shift());

// name = the 1st line of the 2nd section:

    name = result[1].shift();

// The rest of the 2nd section is searched for the phone number, email and facebook.
// Because some of these lines may be missing, we cannot simply use the 
// 1st line for phone, the 2nd line for email and the 3rd for facebook.

    while (result[1].length) {
        var temp = result[1].shift();
        if (temp.search("facebook.com/") == 0) fbook = temp
        else if (temp.search("@") > -1) email = temp
        else phone = temp;
    }

// All the lines in the 3rd section are added to string "extras".
// If the string is not empty, we put a comma between the parts:

    while (result[2].length) {
        if (extras.length) extras += ", ";
        extras += result[2].shift();
    }

// price = the floating-point number at the start of the 1st line of the 4th section:

    price = parseFloat(result[3][0].substring(1));

// All the lines in the 5th section are added to string "comments".
// If the string is not empty, we put a newline between the parts:

    while (result[4].length) {
        if (comments.length) comments += "\n";
        comments += result[4].shift();
    }
}

alert("people: " + people + "\nname: " + name + "\nphone: " + phone + "\nemail: " + email + "\nfbook: " + fbook + "\nextras: " + extras + "\nprice: " + price + "\ncomments: " + comments);