How to set a regular expression to find src only for img?

Question

Regular Expressions

Beaver everyone.
I have been suffering for 3 days already, there is CKEditor, in which I load images via base64image, everything suits me, but I need to store the path to 1 image in the database. (i.e. there can be 20 of them, but we take 1 img and save its src to the database).
'/src="([^"]+)/' I did this, everything suits, but this is finding src for all tags, not just for img
Help comrades, thanks in advance!

Answer 1

symfony.com/doc/current/components/dom_crawler.html

$dom = new Crawler($html);
$images = $dom->filterXPath('//img')->extract(array('src')); // extract images

Answer 2

let regex = /<img.*?src="(.*?)"/;
let src = regex.exec( htmlString )[1];