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<?php $a = 'CG-123-456'; var_dump(preg_split('/CG\-\d+\-\d+/', $a));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MtnZG
function name:  (null)
number of ops:  9
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'CG-123-456'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_split'
          3        SEND_VAL                                                 '%2FCG%5C-%5Cd%2B%5C-%5Cd%2B%2F'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        SEND_VAR                                                 $2
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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