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<?php $tests = [ '/[$-\w]/', '/[\w-$]/', '/[\w-]/', '/[-\w]/', '/[$-]/', '/[-$]/', ]; foreach($tests as $test) { echo "$test\n"; preg_match($test,''); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 11
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 11
Branch analysis from position: 3
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 11
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 11
filename:       /in/fk0Ij
function name:  (null)
number of ops:  13
compiled vars:  !0 = $tests, !1 = $test
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   12     1      > FE_RESET_R                                       $3      !0, ->11
          2    > > FE_FETCH_R                                               $3, !1, ->11
   13     3    >   NOP                                                      
          4        FAST_CONCAT                                      ~4      !1, '%0A'
          5        ECHO                                                     ~4
   14     6        INIT_FCALL                                               'preg_match'
          7        SEND_VAR                                                 !1
          8        SEND_VAL                                                 ''
          9        DO_ICALL                                                 
   12    10      > JMP                                                      ->2
         11    >   FE_FREE                                                  $3
   15    12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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