Finding specific messages from CakePHP 3.x logs

filter.php

<?php
$log = file_get_contents('./src/logs/error-test.log');

// Find all logs messages matching a pattern to process them, filter them out...
$exceptions = ['RecordNotFoundException', 'MissingRouteException', 'MissingActionException', 'MissingControllerException'];
$words = implode($exceptions, '\b|');
$re = '/^.*(\b'.$words.'\b)\][\s\S]+?(?=\n\n)/m';
preg_match_all($re, $log, $matches, PREG_SET_ORDER, 0);

// All found entries in $matches
echo '<pre>';
echo '=> Filtering-out ' . count($matches) . ' entries.';

// and ...the rest
$rest = preg_replace($re, "", $log);
$rest = preg_replace('/^\s+/m', "\n\n", $rest); // removes multiple empty lines
echo $rest;