<?php
$string = "The Chernobyl disaster was a catastrophic nuclear accident that occurred on 26 April 1986, in the No. 4 nuclear reactor at the Chernobyl Nuclear Power Plant, near the city of Pripyat, in the north of the Ukrainian SSR.";
$pattern1 = '%[A-Z]\w+%';
$pattern2 = '%\d+%';
preg_replace_callback_array(
[
$pattern1 => function ($match) {
echo "pattern 1: \n";
print_r($match);
},
$pattern2 => function ($match) {
echo "pattern 2: \n";
print_r($match);
}
],
$string
);