PHP - Modify absolute path/URL of images on a string text

Question

I am trying to migrate old blog posts (based on WP) to a new platform. One of the steps is defined by:

Get full_text of posts
Search for the existence of full path/url of old images (let's set https://stackoverflow.com/uploads/logo.png or just uploads/logo.png)
Extract/save and get the guid() of new images
Switch old path https://stackoverflow.com/uploads/logo.png to a new one (let's see https://quora.com/media/brand123.png

I tried a regex expression to search for old urls: /(http:\/\/stackoverflow\.com\/uploads\/)+(.*?)[a-zA-Z0-9]+(\.jpg|\.png|\.gif)/

And then tried:

$old = array();
$pattern = "/(https:|http:\/\/stackoverflow\.com\/uploads\/)+(.*?)[a-zA-Z0-9]+(\.jpg|\.png|\.gif)/";
$text = "orem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor <img src='https://stackoverflow.com/uploads/image1.png'/> rem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor <img src='https://stackoverflow.com/uploads/image2.png'/>";

// seatch and get old urls
preg_match_all($pattern, $text, $old);

But it get's me something like this:

array(4) {
  [0]=>
  array(2) {
    [0]=>
    string(44) "https://stackoverflow.com/uploads/image1.png"
    [1]=>
    string(44) "https://stackoverflow.com/uploads/image2.png"
  }
  [1]=>
  array(2) {
    [0]=>
    string(6) "https:"
    [1]=>
    string(6) "https:"
  }
  [2]=>
  array(2) {
    [0]=>
    string(28) "//stackoverflow.com/uploads/"
    [1]=>
    string(28) "//stackoverflow.com/uploads/"
  }
  [3]=>
  array(2) {
    [0]=>
    string(4) ".png"
    [1]=>
    string(4) ".png"
  }
}

Nick · Accepted Answer · 2018-08-15 23:05:29Z

I think this regex will do the job a bit better:

#\b((?:https?://stackoverflow\.com/)?uploads/(.*?\.(?:jpg|png|gif)))\b#

I've simplified a bit of yours (e.g. replace https:|http: with https?:) and also removed what seems like an unnecessary [a-zA-Z0-9]+. I've also improved the grouping, making some non-capturing:

The new code (note I added an extra image reference for testing):

$old = array();
$pattern = "#\b((?:https?://stackoverflow\.com/)?uploads/(.*?\.(?:jpg|png|gif)))\b#";
$text = "orem uploads/xyx.gif ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor <img src='https://stackoverflow.com/uploads/image1.png'/> rem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor <img src='https://stackoverflow.com/uploads/image2.png'/>";

// seatch and get old urls
preg_match_all($pattern, $text, $old);
print_r($old);

Output:

Array
(
    [0] => Array
        (
            [0] => uploads/xyx.gif
            [1] => https://stackoverflow.com/uploads/image1.png
            [2] => https://stackoverflow.com/uploads/image2.png
        )

    [1] => Array
        (
            [0] => uploads/xyx.gif
            [1] => https://stackoverflow.com/uploads/image1.png
            [2] => https://stackoverflow.com/uploads/image2.png
        )

    [2] => Array
        (
            [0] => xyx.gif
            [1] => image1.png
            [2] => image2.png
        )

)

If you want to insist that image names only contain [a-zA-Z0-9] then change the .*? to [a-zA-Z0-9]+ i.e.

$pattern = "#\b((?:https?://stackoverflow\.com/)?uploads/([a-zA-Z0-9]+\.(?:jpg|png|gif)))\b#";

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