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<?php $tests = [ '00.12', '0.12', '00', '0', '0012.12', '00023', ]; foreach ($tests as $test) { echo $test . (preg_match('~^0+[1-9]~', $test) ? ' fail' : ' pass') . "\n"; }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 2, Position 2 = 15
Branch analysis from position: 2
2 jumps found. (Code = 78) Position 1 = 3, Position 2 = 15
Branch analysis from position: 3
2 jumps found. (Code = 43) Position 1 = 8, Position 2 = 10
Branch analysis from position: 8
1 jumps found. (Code = 42) Position 1 = 11
Branch analysis from position: 11
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 10
1 jumps found. (Code = 42) Position 1 = 2
Branch analysis from position: 2
Branch analysis from position: 15
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 15
filename:       /in/Ge9OO
function name:  (null)
number of ops:  17
compiled vars:  !0 = $tests, !1 = $test
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   11     1      > FE_RESET_R                                       $3      !0, ->15
          2    > > FE_FETCH_R                                               $3, !1, ->15
   12     3    >   INIT_FCALL                                               'preg_match'
          4        SEND_VAL                                                 '%7E%5E0%2B%5B1-9%5D%7E'
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                         $4      
          7      > JMPZ                                                     $4, ->10
          8    >   QM_ASSIGN                                        ~5      '+fail'
          9      > JMP                                                      ->11
         10    >   QM_ASSIGN                                        ~5      '+pass'
         11    >   CONCAT                                           ~6      !1, ~5
         12        CONCAT                                           ~7      ~6, '%0A'
         13        ECHO                                                     ~7
   11    14      > JMP                                                      ->2
         15    >   FE_FREE                                                  $3
   13    16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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