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<?php $string = '<iframe width="640" height="360" src="http://www.youtube.com/embed/h9jOaIB1VGo?rel=0&wmode=transparent" frameborder="0" allowfullscreen></iframe>'; preg_match('/(youtu\.be\/|youtube\.com\/(watch\?(.*&)?v=|(embed|v)\/))([^\?&"\'>]+)/', $string, $matches); var_dump(reset($matches));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/tfdha
function name:  (null)
number of ops:  13
compiled vars:  !0 = $string, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%3Ciframe+width%3D%22640%22+height%3D%22360%22+src%3D%22http%3A%2F%2Fwww.youtube.com%2Fembed%2Fh9jOaIB1VGo%3Frel%3D0%26wmode%3Dtransparent%22+frameborder%3D%220%22+allowfullscreen%3E%3C%2Fiframe%3E'
    4     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%28youtu%5C.be%5C%2F%7Cyoutube%5C.com%5C%2F%28watch%5C%3F%28.%2A%26%29%3Fv%3D%7C%28embed%7Cv%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                                                 
    5     6        INIT_FCALL                                               'var_dump'
          7        INIT_FCALL                                               'reset'
          8        SEND_REF                                                 !1
          9        DO_ICALL                                         $4      
         10        SEND_VAR                                                 $4
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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