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<?php $youtube = "https://www.youtube.com/watch?v=9g30pPikveg&feature=youtu.be"; preg_match("/^(?:http(?:s)?:\/\/)?(?:www\.)?(?:m\.)?(?:youtu\.be\/|youtube\.com\/(?:(?:watch)?\?(?:.*&)?v(?:i)?=|(?:embed|v|vi|user)\/))([^\?&\"'>]+)/", $youtube, $matches); var_dump($matches[1]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/9rDXl
function name:  (null)
number of ops:  11
compiled vars:  !0 = $youtube, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D9g30pPikveg%26feature%3Dyoutu.be'
    3     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%5E%28%3F%3Ahttp%28%3F%3As%29%3F%3A%5C%2F%5C%2F%29%3F%28%3F%3Awww%5C.%29%3F%28%3F%3Am%5C.%29%3F%28%3F%3Ayoutu%5C.be%5C%2F%7Cyoutube%5C.com%5C%2F%28%3F%3A%28%3F%3Awatch%29%3F%5C%3F%28%3F%3A.%2A%26%29%3Fv%28%3F%3Ai%29%3F%3D%7C%28%3F%3Aembed%7Cv%7Cvi%7Cuser%29%5C%2F%29%29%28%5B%5E%5C%3F%26%22%27%3E%5D%2B%29%2F'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    4     6        INIT_FCALL                                               'var_dump'
          7        FETCH_DIM_R                                      ~4      !1, 1
          8        SEND_VAL                                                 ~4
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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