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<?php foreach ([ 'agh,', 'no match', 'this has, a thing', 'foo,'] as $example) { var_dump(preg_match('/[a-zA-Z0-9]{1,3},/', $example)); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 1, Position 2 = 10
Branch analysis from position: 1
2 jumps found. (Code = 78) Position 1 = 2, Position 2 = 10
Branch analysis from position: 2
1 jumps found. (Code = 42) Position 1 = 1
Branch analysis from position: 1
Branch analysis from position: 10
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 10
filename:       /in/qB1pO
function name:  (null)
number of ops:  12
compiled vars:  !0 = $example
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E > > FE_RESET_R                                       $1      <array>, ->10
          1    > > FE_FETCH_R                                               $1, !0, ->10
    4     2    >   INIT_FCALL                                               'var_dump'
          3        INIT_FCALL                                               'preg_match'
          4        SEND_VAL                                                 '%2F%5Ba-zA-Z0-9%5D%7B1%2C3%7D%2C%2F'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $2      
          7        SEND_VAR                                                 $2
          8        DO_ICALL                                                 
    3     9      > JMP                                                      ->1
         10    >   FE_FREE                                                  $1
    5    11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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