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<?php $string = 'a'; if (!preg_match('/^[a-z0-9].*[a-z0-9]$/i', $string)) { print 'FAIL'; } else { print 'OK'; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 7, Position 2 = 9
Branch analysis from position: 7
1 jumps found. (Code = 42) Position 1 = 10
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/i5SLj
function name:  (null)
number of ops:  11
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'a'
    4     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%5E%5Ba-z0-9%5D.%2A%5Ba-z0-9%5D%24%2Fi'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $2      
          5        BOOL_NOT                                         ~3      $2
          6      > JMPZ                                                     ~3, ->9
    5     7    >   ECHO                                                     'FAIL'
          8      > JMP                                                      ->10
    7     9    >   ECHO                                                     'OK'
    8    10    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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