How to replace https:// to //

Hello Experts,

I want to replace all theme file URL https:// to //

From
<img src=”https://example.com/image.jpg&#8221; alt=”image”>

To
<img src=”//example.com/image.jpg” alt=”image”>

Automatically Change All URL from HTTP:// to //

Is there any script which one I can add into function.php and it’ll work accordingly.

I get “insecure content” warnings from some of my content
We are probably loading content (such as images) with a URL that starts with “http:”. Take that bit away, but leave the slashes, e.g. //www.example.com/image.png; our browser will load the content, using HTTPS when your page uses it.

Thanks,
Group Of Oceninfo