preg_match() 不匹配 img src

Question

I have this string in a php variable.

$str = 'This is an iamge: <img src="images/Christmas.PNG" width=70%; height=40%">';

The pattern I am searching:

$pattern = '/<img src="(.*?)>/g';

I then have this preg_match()

preg_match($pattern, $str, $matches, PREG_OFFSET_CAPTURE);

When i go to print $matches either directly by echo $matches or in a foreach loop, the variable is null.

Why is this happening? Thanks.

Answer 1

Don't use regexes for parsing HTML . There are tools designed for this very thing.

You can use DOMDocument to parse the HTML and then easily get the value of the src attribute:

$previous_value = libxml_use_internal_errors(true);
$string = 'This is an iamge: <img src="images/Christmas.PNG" width=70%; height=40%">';
$dom = new DOMDocument();
$dom->loadHTML($string);
echo $dom->getElementsByTagName('img')->item(0)->getAttribute("src");
libxml_clear_errors();
libxml_use_internal_errors($previous_value);

Demo