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mgtm3Flag for Israel

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can someone tell me what is this? about regular expression

http://fdsawfa.com/iafdqe.html?&page=286

and i want to use the preg match all or any other function
to output for me
286

soo people told me to use
preg_match_all('/(?<=[?&]page=)[^&?]*/',$yourvar,$match)){


can someone tell me exactly what eatch part is?
beacuse i want to know what i am using and not only to use it
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ddrudik
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Thanks for the question and the points.