Add ProjectZomboidBurdJournalsLog (BurdJournals.txt)

Per-line warnings emitted by the BurdJournals mod, format
'[time] [BurdJournals] LEVEL: message.'. Parser captures time, the
[BurdJournals] tag as the entry prefix, and the LEVEL token. Detectors:
filename match plus content signature on the literal '[BurdJournals]'
tag bracket.

src/Pattern/ProjectZomboid/BurdJournalsPattern.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Pattern\ProjectZomboid;
+
+/**
+ * Regex constants for the Project Zomboid BurdJournals.txt format.
+ *
+ *   [time] [BurdJournals] LEVEL: message.
+ *
+ * LINE captures, in order:
+ *   1. time
+ *   2. tag    (e.g. BurdJournals)
+ *   3. level  (WARNING | ERROR | INFO | DEBUG)
+ */
+class BurdJournalsPattern
+{
+    public const string LINE = '/^\[(\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3})\] \[(\w+)\] (WARNING|ERROR|INFO|DEBUG): .+\.?$/';
+}