php preg_match - 匹配[POLYLINE]和[END]之间的字符

Question

To my shame, i know not how to use regular expressions properly. I have a large text file, and i am interested in matching every occurence of strings between the tags [POLYLINE] and [END]. The structure does not nest, meaning i do not have other [POLYLINE] and [END] tags inside other [POLYLINE] and [END]. I have tried :

preg_match_all('/\[POLYLINE\](.*?)\[END\]/', $fileContents, $matches);

Hoping to get an array of strings inside $matches. This returns something, but not what i need.

Answer 1

Add s flag for DOTALL functionality which will make it match across multiple lines:

preg_match_all('/\[POLYLINE\](.*?)\[END\]/s', $fileContents, $matches);