Regular expressions - replacement of url

Question

I have in my string $content many url:

<a href="https://domain/wp-content/uploads/2018/07/sample-Wokal-2.jpg"><img class="alignright size-full wp-image-6608" src="https://domain/wp-content/uploads/2018/07/sample-Wokal-2.jpg" alt="sample Wokal 2" width="933" height="617" /></a>

<a href="https://domain/wp-content/uploads/2014/01/sample-lato-123.jpg"><img class="alignright size-full wp-image-6608" src="https://domain/uploads/2014/01/sample-lato-123.jpg" alt="sample lato 123" width="933" height="617" /></a>

etc

Is it possible replace all links to: - https://domain/files/sample-lato-123.jpg , - https://domain/files/sample-Wokal-2.jpg ,

etc?

How to do it? I tried str_replace - but I have different types of links and I do not know how to replace them. I do not know about regular expressions :(

Please help.

Answer 1

You can use this regex which does lookarounds to ensure the string that needs to be replaced is indeed the one we want,

(?<=domain).*?(?=sample)

and replace with

/files/

Here is sample PHP code,

$str = '<a href="https://domain/wp-content/uploads/2018/07/sample-Wokal-2.jpg"><img class="alignright size-full wp-image-6608" src="https://domain/wp-content/uploads/2018/07/sample-Wokal-2.jpg" alt="sample Wokal 2" width="933" height="617" /></a>\n<a href="https://domain/wp-content/uploads/2014/01/sample-lato-123.jpg"><img class="alignright size-full wp-image-6608" src="https://domain/uploads/2014/01/sample-lato-123.jpg" alt="sample lato 123" width="933" height="617" /></a>';
echo preg_replace('/(?<=domain).*?(?=sample)/', '/files/', $str);

Prints,

<a href="https://domain/files/sample-Wokal-2.jpg"><img class="alignright size-full wp-image-6608" src="https://domain/files/sample-Wokal-2.jpg" alt="sample Wokal 2" width="933" height="617" /></a>\n<a href="https://domain/files/sample-lato-123.jpg"><img class="alignright size-full wp-image-6608" src="https://domain/files/sample-lato-123.jpg" alt="sample lato 123" width="933" height="617" /></a>

Let me know if this works fine for you.