PHP Using RegEx to get substring of a string

Question

I\'m looking for an way to parse a substring using PHP, and have come across preg_match however I can\'t seem to work out the rule that I need.

I am parsing a web p

Answer 1

Unfortunately, you have a malformed url query string, so a regex technique is most appropriate. See what I mean.

There is no need for capture groups. Just match id= then forget those characters with \K, then isolate the following one or more digital characters.

Code (Demo)

$str = 'producturl.php?id=736375493?=tm';
echo preg_match('~id=\K\d+~', $str, $out) ? $out[0] : 'no match';

Output:

736375493