Preg_replace wont remove each img tag with src address

Question

I am working on my PHP to search for the images that come the specific address so I want to remove all of these img tags.

I have the img tags which show like this:

<img src="http://example.com/someimage1.jpeg">
<img src="http://example.com/someimage2.jpeg">
<img src="http://example.com/someimage3.jpeg">
<img src="http://example.com/someimage4.jpeg">
<img style="OVERFLOW: hidden; WIDTH: 0px; MAX-HEIGHT: 0px" alt="" src="http://test.mydomain.com/project433q325/track/Images/signature.gif?id=446&amp;etc=1586624376">

When I try this:

foreach ($src as $image) {
    $image = preg_replace("\<img src\=\"(.+)\"(.+)\/\>/i", '', $src);
}

It will not remove the img tag, so I have also tried this:

foreach ($src as $image) {
    $image = preg_replace("/<img[^>]+\>/i", "", $src); 
}

I still have the same issue as it will not remove the img tag.

Here is the full code:

if (strpos($inbox_message, 'http://test.mydomain.com/project433q325/track/Images/signature.gif?') !== false) {
    $doc = new DOMDocument();
    $doc->loadHTML($inbox_message);
    $xpath = new DOMXpath($doc);
    $src = $xpath->evaluate("string(//img/@src)");

    if ($src) {
        foreach ($src as $image) {
            //image->nodeValue = preg_replace('<img.*?src='.$src.'.*?/>!i', '', $src);
            //$src = preg_replace("/<img[^>]+\>/i", "", $src);
            $image = preg_replace("\<img src\=\"(.+)\"(.+)\/\>/i", '', $src);
        //}
    }
    $inbox_message = $doc->saveHTML();
} 

What I am trying to do is I only want to search for the img tags that have the src address which show ' http://test.mydomain.com/project433q325/track/Images/signature.gif ?' and remove them.

Can you please show me an example how I can search for each img tag that have specific src address so I can remove each img tags using preg_replace?

Thank you.

EDIT: Here is the $inbox_message variable:

$inbox_message = '<img src="http://example.com/someimage1.jpeg"><img src="http://example.com/someimage2.jpeg"><img src="http://example.com/someimage3.jpeg"><img src="http://example.com/someimage4.jpeg"><img style="OVERFLOW: hidden; WIDTH: 0px; MAX-HEIGHT: 0px" alt="" src="http://test.mydomain.com/project433q325/track/Images/signature.gif?id=446&amp;etc=1586624376">';

Answer 1

You should not use a regex for this. You can use your strpos as you were but move it inside the DOM parsing and compare each img . You can then use removeChild() to remove the appropriate images. (This is an adapted answer from How to delete element with DOMDocument? )

<?php
$inbox_message = '<p> Keep This</p><img src="http://example.com/someimage1.jpeg"><img src="http://example.com/someimage2.jpeg"><img src="http://example.com/someimage3.jpeg"><img src="http://example.com/someimage4.jpeg"><h1>Fake element</h1><img style="OVERFLOW: hidden; WIDTH: 0px; MAX-HEIGHT: 0px" alt="" src="http://test.mydomain.com/project433q325/track/Images/signature.gif?id=446&amp;etc=1586624376">';
$doc = new DOMDocument();
$doc->loadHTML($inbox_message);
$imgs = $doc->getElementsByTagName('img');
for($i = $imgs->length; --$i >= 0;){
    $node = $imgs->item($i);
    if (strpos($node->getAttribute('src'), 'http://test.mydomain.com/project433q325/track/Images/signature.gif?') !== false) {
        $node->parentNode->removeChild($node);
    }
}
echo $doc->savehtml();

https://3v4l.org/qinLR

You also could use strtolower if $node->getAttribute('src') might contain varying case. The needle for strpos should also be lowercased in that case.

For regex issues...

preg_replace("\<img src\=\"(.+)\"(.+)\/\>/i", '', $src);

The start of the regex is attempting to use a backslash which is not a valid delimiter . A delimiter can be any non-alphanumeric, non-backslash, non-whitespace character. The starting delimiter must match the ending delimiter. Additionally your $src only contained the value of the attribute so <img src... would never match.

If you were to get that functioning the .+ would need to be replaced with the URI you wanted to check against.

BUT regex really is the wrong approach here. Use a parser, as you were, for these type of jobs. Regex shouldn't be used for structured data. If it is structured there likely already are functions written for it.

Answer 2

To remove all img tags, use the following regex pattern:

<img\s+[^>]+>

https://regex101.com/r/HfStzZ/1

---

To include the specific src url as you described in your question, use the following regex pattern:

<img\s+[^>]*\bsrc="[^"]*\/signature\.gif[^\>]*\>

https://regex101.com/r/HfStzZ/2

---

In PHP, use the preg_replace command as follows:

$output = preg_replace('/<img\s+[^>]*\bsrc="[^"]*\/signature\.gif[^\>]*\>/', '', $input);