PHP - 在无法确定长度时查找并替换两个变量之间的字符串

Question

I'm trying to create a simple PHP find and replace system by looking at all of the images in the HTML and add a simple bit of code at the start and end of the image source. The image source has something like this:

<img src="img/image-file.jpg">

and it should become into this:

<img src="{{media url="wysiwyg/image-file.jpg"}}"

The Find

="img/image-file1.jpg"
="img/file-2.png"
="img/image3.jpg"

Replace With

="{{media url="wysiwyg/image-file.jpg"}}"
="{{media url="wysiwyg/file-2.png"}}"
="{{media url="wysiwyg/image3.jpg"}}"

The solution is most likely simple yet from all of the research that I have done. It only works with one string not a variety of unpredictable strings.

Current Progress

$oldMessage = "img/";
$deletedFormat = '{{media url="wysiwyg/';
$str = file_get_contents('Content Slots/Compilied Code.html');
$str = str_replace("$oldMessage", "$deletedFormat",$str);

The bit I'm stuck at is find the " at the end of the source to add the end of the required code "}}"

Answer 1

I don't like to build regular expressions to parse HTML, but it seems that in this case, a regular expression will help you:

$reg = '/=["\']img\/([^"\']*)["\']/';
$src = ['="img/image-file1.jpg"', '="img/file-2.png"', '="img/image3.jpg"'];

foreach ($src as $s) {
    $str = preg_replace($reg, '={{media url="wysiwyg/$1"}}', $s);
    echo "$str
";
}

Here you have an example on Ideone.

To make it works with your content:

$content = file_get_contents('Content Slots/Compilied Code.html');
$reg = '/=["\']img\/([^"\']*)["\']/';
$final = preg_replace($reg, '={{media url="wysiwyg/$1"}}', $content);

Here you have an example on Ideone.