How to use regex in PHP to get int after slash in string -

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I tried to make a code in PHP which gets the subject id after a forward slash in a given string. Although the problem is that its return is nothing, how can I return it? 
  echo preg_match ('/ ([^ /] +' / ',' english / 478 ', $ discussion_id); sampling $ discussion_id;   
 This is for an online forum, thanks for your help; It is highly appreciated if you need more information, please do not hesitate to leave a comment.   
 
 
  preg_match ("# / (\ d +) $ #", 'learn-english / 478', $ discussion_id);   
 This will work for you.  
  ID  (match number) to print; Need to resonate  $ discussion_id [1] .  
 This is a job.  
 
 For the new string, you will not need String expiration match ( $ ). Thus, regex will be:  
  preg_match ("# / (\ d +) #", 'pen-palms to explore / 1161 & amp; t = visual debate, $ discussion_id); Sampling $ discussion_id [1];

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