How to write a regular expression to cut out extra text?

Question

Regular Expressions

Hello!

I have a log like this:

27527 php /var/www/html/worker/Worker.php 3256 1581264072
27726 php /var/www/html/src/Controller/../../worker/Worker.php 3847

There are two types of lines here:
27726 php /var/www/html/src/Controller/../../worker/Worker.php 3847
and
27527 php /var/www/html/worker/Worker.php 3256 1581264072

I need cut the 4 digit ID from all row types (in bold), and delete the rest:
27726 php /var/www/html/src/Controller/../../worker/Worker.php 3847
and
27527 php /var/www/ html/worker/Worker.php 3256 1581264072

To end up with a log like this:

3847
3256
...

How can I write a regular expression for this task?

Answer 1

https://regex101.com/r/69tjgA/1