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<?php $str = 'xxABC1xxxABC2xx'; if ( preg_match('/x[A-Z]+\d(?!.*x[A-Z]+\d)/', $str, $match) ) print_r($match[0]);
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 11
Branch analysis from position: 7
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 11
filename:       /in/1tHKH
function name:  (null)
number of ops:  12
compiled vars:  !0 = $str, !1 = $match
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'xxABC1xxxABC2xx'
    5     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2Fx%5BA-Z%5D%2B%5Cd%28%3F%21.%2Ax%5BA-Z%5D%2B%5Cd%29%2F'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                         $3      
          6      > JMPZ                                                     $3, ->11
    6     7    >   INIT_FCALL                                               'print_r'
          8        FETCH_DIM_R                                      ~4      !1, 0
          9        SEND_VAL                                                 ~4
         10        DO_ICALL                                                 
         11    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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