PHP regex check if string not contain string then replace

Question

I have a long string that contain many img tags (PHP):

$content = '<img src="url" class="img lazy"/><div class="wrap"><img src="url" class="img" /></div><img src="url" class="lazy" />';`

How to use regex to check in string: if not contain class "lazy" then change src to data-src?

In this case the output is:

<img src="url" class="img lazy"/><div class="wrap"><img data-src="url" class="img" /></div><img src="url" class="lazy" />

i think you're better off using an HTML parser instead, check out `DOMDocument` — Kevin, Sep 30 '19 at 09:57
if (preg_match('/class="lazy"/',$content)) can check if you have a class=lazy in the string. But it's not what I'd recommend. — Arundeep Chohan, Sep 30 '19 at 10:16

score 0 · Answer 1 · answered Sep 30 '19 at 10:23

0

preg_replace('/(?<=\<img )src(?=.+?lazy\"\>)/g', "data-src", $content);

answered Sep 30 '19 at 10:23

1 Answers1