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<?php $re = '%^ ((?=x))? ((?=y))? (\w) $%mx'; $str = 'x y z'; preg_match_all($re, $str, $matches, PREG_SET_ORDER | PREG_UNMATCHED_AS_NULL, 0); // Print the entire match result var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/bu1Sf
function name:  (null)
number of ops:  13
compiled vars:  !0 = $re, !1 = $str, !2 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%25%5E%0A++++%28%28%3F%3Dx%29%29%3F%0A++++%28%28%3F%3Dy%29%29%3F%0A++++%28%5Cw%29%0A%24%25mx'
    9     1        ASSIGN                                                   !1, 'x%0Ay%0Az'
   13     2        INIT_FCALL                                               'preg_match_all'
          3        SEND_VAR                                                 !0
          4        SEND_VAR                                                 !1
          5        SEND_REF                                                 !2
          6        SEND_VAL                                                 514
          7        SEND_VAL                                                 0
          8        DO_ICALL                                                 
   16     9        INIT_FCALL                                               'var_dump'
         10        SEND_VAR                                                 !2
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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