Trying to match src part of HTML <img> tag Regular Expression - regex

Question

I've got a bunch of strings already separated from an HTML file, examples:
<img alt="" src="//i.imgur.com/tApg8ebb.jpg" title="Some manly skills for you guys<p><span class='points-q7Vdm'>18,736</span> <span class='points-text-q7Vdm'>points</span> : 316,091 views</p>">
<img src="//i.imgur.com/SwmwL4Gb.jpg" width="48" height="48">
<img src="//s.imgur.com/images/blog_rss.png">
I am trying to make a regular expression that will grab the src="URL" part of the img tag so that I can replace it later based on a few other conditions. The many instances of quotation marks are giving me the biggest problem, I'm still relatively new with Regex, so a lot of the tricks are out of my knowledge,
Thanks in advance

Answer 1

Use DOM or another parser for this, don't try to parse HTML with regular expressions.
Example:
$html = <<<DATA
<img alt="" src="//i.imgur.com/tApg8ebb.jpg" title="Some manly skills for you guys<p><span class='points-q7Vdm'>18,736</span> <span class='points-text-q7Vdm'>points</span> : 316,091 views</p>">
<img src="//i.imgur.com/SwmwL4Gb.jpg" width="48" height="48">
<img src="//s.imgur.com/images/blog_rss.png">
DATA;
$doc = new DOMDocument();
$doc->loadHTML($html); // load the html
$xpath = new DOMXPath($doc);
$imgs = $xpath->query('//img');
foreach ($imgs as $img) {
echo $img->getAttribute('src') . "\n";
}
Output
//i.imgur.com/tApg8ebb.jpg
//i.imgur.com/SwmwL4Gb.jpg
//s.imgur.com/images/blog_rss.png
If you would rather store the results in an array, you could do..
foreach ($imgs as $img) {
$sources[] = $img->getAttribute('src');
}
print_r($sources);
Output
Array
(
[0] => //i.imgur.com/tApg8ebb.jpg
[1] => //i.imgur.com/SwmwL4Gb.jpg
[2] => //s.imgur.com/images/blog_rss.png
)

Answer 2

$pattern = '/<img.+src="([\w/\._\-]+)"/';
I'm not sure which language you're using, so quote syntax will vary.