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<?php $str = 'KX02AB1234'; $str = preg_replace('/(?<=[a-z])(?=\d)|(?<=\d)(?=[a-z])/i', '-', $str); echo $str;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/jKBu0
function name:  (null)
number of ops:  9
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'KX02AB1234'
    4     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%28%3F%3C%3D%5Ba-z%5D%29%28%3F%3D%5Cd%29%7C%28%3F%3C%3D%5Cd%29%28%3F%3D%5Ba-z%5D%29%2Fi'
          3        SEND_VAL                                                 '-'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ASSIGN                                                   !0, $2
    5     7        ECHO                                                     !0
    6     8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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