Question

Warning: preg_match_all() [function.preg-match-all]: Unknown modifier 'l' in /var/www/test.php on line 9

It’s saying my regex has an unknown modifier, but I’m not sure what exactly is happening to trigger the error

preg_match_all("/\<select id\=\'subscription_division_id\'(.+?)</select>\/is", $html, $matches);

Answer 1

You are escaping wrong. For the regex parser, the following is your regex:

\<select id\=\'subscription_division_id\'(.+?)<

whereas select>\/is is supposed to be the regexp modifiers (the regex string is enclosed in /). Given that the l in there is the first invalid modifier, you receive that error. So to fix that, you need to escape the slash in the closing tag. And btw. you are escaping quite a lot unnecessary things, this is enough:

preg_match_all("/<select id='subscription_division_id'(.+?)<\/select>/is", $html, $matches);