如何匹配所有“类型”并正确地逃避正则表达式？

I am currently struggling to match the content of following "Types":

(Type): multiplechoice
(Category): 0
(Random answers): 0
(Question): Which of the following is true about pre-test imagery?

(Type): multiplechoice
(Category): 0
(Random answers): 1
(Question): Which of the following is not true about the TMJ?

I am trying:

preg_match_all("(Type)\:(.+?)
", $content, $types);

But I get an unknown modifier "\" as an error message.

How can I properly match all the types? Thanks for any hints!

This should do, assuming there is space after :

preg_match_all('/\((.+?)\): (.*)?/i', $subject, $array, PREG_PATTERN_ORDER);