How to wrap numbers in regular expression tag in php?

Question

PHP

Greetings. There is a date output in php in the following format:
September 23
Task, wrap numbers in
How to highlight numbers clearly, but how to wrap them in a tag?

Answer 1

$str = '23 сентября';
$result = preg_replace('/([0-9]+)/', '<strong>$1</strong>', $str);

It's not clear which tag you need to wrap the number in, so I used strong as an example.