The documentation for FiltaQuilla's more complex features is lacking. To try to help that, here is some example code.

Header Regex Match

sender:jslr[0-9][0-9]\.fr

recipients:/work-(.+)@abc\.com/i

(note: the slashes are only needed when you want to use regexp flags at the end

subject:Case \d+ Dispatched

Per this page, some common headers are:

"subject", "sender", "message-id", "references", "recipients", "date", "size", "flags", "priority", "label" (obsolete TB 1.5 term), "statusOfset" (yes it is really spelled that way), "ccList", "bccList", "msgThreadId", "threadFlags", "threadId", "threadSubject", "msgCharSet", "threadParent", "junkscore" (either null, 0, or 100), "junkpercent", "junkscoreorigin", "threadNewestMsgDate", "msgOffset", "offlineMsgSize"

Javascript Match

/somename/.test( message.getStringProperty('sender') );

/somename/.test( message.getStringProperty('replyTo') );

let tags = message.getStringProperty('keywords');
(/pro/.test(tags) && !(/done/.test(tags));

let sentDate = new Date(message.date/1000);
(sentDate.getHours() >= 12 && sentDate.getHours() < 18)

logger = 'MESSAGE : ' + message.getStringProperty('subject') + '\n';
let evohdr = message.getStringProperty('x-evolution');
logger += 'THUNDERBIRD FLAGS BEFORE : ' + message.flags + '\n';
evostatus = evohdr.substring(evohdr.length - 4, evohdr.length);
logger += 'EVOLUTION HEXA : ' + evostatus + '\nSTATUS : \n';
var hexevostatus = parseInt(evostatus, 16);
var flags = message.flags;
deleted = false;
if (hexevostatus & 1<<0) {
  logger += '   * is answered\n';
  flags = flags | 1<<1
}
if (hexevostatus & 1<<1) {
  logger += '   * is deleted\n';
  deleted = true;
}
if (hexevostatus & 1<<3) {
  logger += '   * is marked as important\n';
  flags = flags | 1<<2
}
if (hexevostatus & 1<<4) {
  logger += '   * is read\n';
  flags = flags | 1<<0
}
if (hexevostatus & 1<<5) {
  logger += '   * has attachment(s)\n';
  flags = flags | 1<<28
}
if (hexevostatus & 1<<7) {
  logger += '   * is junk\n';
  message.setStringProperty('junkscore', 100);
  message.setStringProperty('junkscoreorigin','user');
}
if (hexevostatus & 1<<11) {
  logger += '   * has been marked as not junk (no action)\n';
}
if (hexevostatus & 1<<12) {
  logger += '   * has been forwarded\n';
  flags = flags | 1<<12
}
message.flags = flags;
logger += 'THUNDERBIRD FLAGS SET TO : ' + flags + '\n';
logger +='WILL DELETE ? : ' + deleted;
Cc["@mozilla.org/consoleservice;1"]
   .getService(Ci.nsIConsoleService)
   .logStringMessage(logger);

Javascript Action

• nsIArray msgHdrs
• AUTF8String actionValue
• nsIMsgCopyServiceListener copyListener
• nsMsgFilterTypeType filterType
• nsIMsgWindow msgWindow

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Javascript Action with Body

• [1] and similar

for (let index = 0; index < msgHdrs.length; index++)
{
  let hdr = msgHdrs.queryElementAt(index, Ci.nsIMsgDBHdr);
  hdr.subject = "[Hello, world] " + hdr.subject;
}

msgHdrs.queryElementAt(0, Ci.nsIMsgDBHdr).folder.deleteMessages(msgHdrs, msgWindow, true, false, null, false);