$re = '/\|.*?(?:;|$)/m';
$str = '40|https://site1.com/files/02bea218b601ef2cbc74e08dc8d78_1000_1000.png;77|https://site1.com/files/29037cbdc27707fe2d6b2cf4d3924_1000_1000.png;78|https://site1.com/files/923b6f214f8bffcf20fbbebe5365b_1000_1000.png;85|https://site1.com/files/f8b6dbe261e89877e23e6a6f00003_1000_1000.png';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php