Positive expressions match attribute values ​​of html tags

　Today, due to work requirements, I need to obtain the attribute value of the html tag. I immediately thought of regular expressions. The tag is as follows:

You need to obtain the cx and cy attribute values ​​of the tag , thought for a while and wrote one:

$circle is the content of the circle tag above

preg_match_all('/]*?cxs*=s*('|") (.*?)\1[^>]*?cys*=s*('|")(.*?)\1[^>]*?/?s*>/i', $circle , $arr);

var_dump($arr);

$arr[2] is the value of cx, $arr[4] is the value of cy.

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The above introduces the positive value expression to match the attribute value of the html tag, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.