regular expression help for import data in database by array loop

I have a text file where all the question and answer is there like bellow text

question l : Regular expression problem in C#  

answer 1 :   regular expression answer 1

question  2 : Regular expression problem in php 

answer 2 :   regular expression answer 2

etc...

I made this like bellow

<question> question l : Regular expression problem in C# </question> 

<answer> answer 1 : regular expression answer 1</answer>

<--page-->

<question>question 2 : Regular expression problem in php </question>

<answer>answer 2 : regular expression answer 1</answer>

<--page-->

So that i can made a array and foreach loop i can insert that to my data base in bellow table

question_id, question answer

1 Regular expression problem in C# regular expression answer 1

2 Regular expression problem in php regular expression answer 2

any one can help me to build the regular expression, i build this one but it include question text in answer text

preg_match_all("#^(?<!<question>).*<question>.*?</question>(?!.*<question>)#",$temp_data,$question);
preg_match_all("#^(?<!<answer>).*<answer>.*?</answer>(?!.*<answer>)#",$temp_data,$answer);