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<?php $words = "systematic,gear,synthesis,mysterious"; $words=explode(",",$words); $res = preg_grep('~(?=[^s]*s)(?=[^m]*m)(?=[^e]*e)~', $words); print_r($res);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/jLOJm
function name:  (null)
number of ops:  15
compiled vars:  !0 = $words, !1 = $res
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'systematic%2Cgear%2Csynthesis%2Cmysterious'
    4     1        INIT_FCALL                                               'explode'
          2        SEND_VAL                                                 '%2C'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $3      
          5        ASSIGN                                                   !0, $3
    6     6        INIT_FCALL                                               'preg_grep'
          7        SEND_VAL                                                 '%7E%28%3F%3D%5B%5Es%5D%2As%29%28%3F%3D%5B%5Em%5D%2Am%29%28%3F%3D%5B%5Ee%5D%2Ae%29%7E'
          8        SEND_VAR                                                 !0
          9        DO_ICALL                                         $5      
         10        ASSIGN                                                   !1, $5
    7    11        INIT_FCALL                                               'print_r'
         12        SEND_VAR                                                 !1
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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