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<?php $matches = array(); echo preg_match('/(\[url=(?:.*?)\])/is', '[url=fart]', $matches); print_r($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/LT4T9
function name:  (null)
number of ops:  11
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%28%5C%5Burl%3D%28%3F%3A.%2A%3F%29%5C%5D%29%2Fis'
          3        SEND_VAL                                                 '%5Burl%3Dfart%5D'
          4        SEND_REF                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
    4     7        INIT_FCALL                                               'print_r'
          8        SEND_VAR                                                 !0
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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