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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 8.5.0


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