How to match a part of an <iframe> tag?

Question

I\'m trying to match the highlighted parts of this string:

 maybe something here src=\"http://some.random.url.com/\" and the string continues.         


        

Answer 1

]*(src="[^"]+")[^>]*|', $html, $matches);

var_dump($matches);

Output:

array(2) {
  [0]=>
  string(75) "