Extract info from email body with Google Scripts - regex

Question

I am trying to extract specific info from email in one of my labels in Gmail. I've hacked (my scripting knowledge is very limited) the following together based on a script from https://gist.github.com/Ferrari/9678772. I am getting an error though: "Cannot convert Array to Gmail Thread - Line 5"
Any help will be greatly appreciated.
/* Based on https://gist.github.com/Ferrari/9678772 */
function parseEmailMessages(start) {
/* var threads = GmailApp.getInboxThreads(start, 100); */
var threads = GmailApp.getMessagesForThread(GmailApp.search("label:labelname"));
var sheet = SpreadsheetApp.getActiveSheet();
var tmp, result = [];
for (var i = 0; i < threads.length; i++) {
// Get the first email message of a threads
var message = threads[i].getMessages()[0];
// Get the plain text body of the email message
// You may also use getRawContent() for parsing HTML
var content = messages[0].getPlainBody();
// Implement Parsing rules using regular expressions
if (content) {
tmp = content.match(/Name and Surname:\n([A-Za-z0-9\s]+)(\r?\n)/);
var username = (tmp && tmp[1]) ? tmp[1].trim() : 'No username';
tmp = content.match(/Phone Number:\n([\s\S]+)/);
var phone = (tmp && tmp[1]) ? tmp[1] : 'No phone';
tmp = content.match(/Email Address:\n([A-Za-z0-9#.]+)/);
var email = (tmp && tmp[1]) ? tmp[1].trim() : 'No email';
tmp = content.match(/Prefered contact office:\n([\s\S]+)/);
var comment = (tmp && tmp[1]) ? tmp[1] : 'No office';
sheet.appendRow([username, phone, email, comment]);
}
}
};

Answer 1

Thanks folks.. This did the trick:
// Adapted from https://gist.github.com/Ferrari/9678772
function processInboxToSheet() {
// Have to get data separate to avoid google app script limit!
var start = 0;
var label = GmailApp.getUserLabelByName("yourLabelName");
var threads = label.getThreads();
var sheet = SpreadsheetApp.getActiveSheet();
var result = [];
for (var i = 0; i < threads.length; i++) {
var messages = threads[i].getMessages();
var content = messages[0].getPlainBody();
// implement your own parsing rule inside
if (content) {
var tmp;
tmp = content.match(/Name and Surname:\n([A-Za-z0-9\s]+)(\r?\n)/);
var username = (tmp && tmp[1]) ? tmp[1].trim() : 'No username';
tmp = content.match(/Phone Number:\n([\s\S]+)/);
var phone = (tmp && tmp[1]) ? tmp[1] : 'No phone';
tmp = content.match(/Email Address:\n([A-Za-z0-9#.]+)/);
var email = (tmp && tmp[1]) ? tmp[1].trim() : 'No email';
tmp = content.match(/Prefered contact office:\n([\s\S]+)/);
var comment = (tmp && tmp[1]) ? tmp[1] : 'No office';
sheet.appendRow([username, phone, email, comment]);
Utilities.sleep(500);
}
}
};

Answer 2

var threads = GmailApp.getMessagesForThread(GmailApp.search("label:labelname"));
should include an array index since GmailApp.search returns an array, even if only one item is found.
var threads = GmailApp.getMessagesForThread(GmailApp.search("label:labelname")[0]);
would work but is wordy.
var thread_list = GmailApp.search("label:labelname");
var threads = GmailApp.getMessagesForThread(thread_list[0]);
IMO, the above is clearer in meaning.