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<?php $str = "QR12345678"; var_dump( preg_match('/^[A-Z]{1,3}[0-9]{4,10}$/', $str) ); var_dump( preg_match('/^[A-Z]{1,3}?[0-9]{4,10}$/', $str) ); var_dump( preg_match('/([A-Z]{1,3})?[0-9]{4,10}$/', $str) ); var_dump( preg_match('/^([A-Z]{1,3})?[0-9]{4,10}$/', $str) ); var_dump( preg_match('/[A-Z]{0,3}[0-9]{4,10}/', $str) ); var_dump( preg_match('/([A-Z]{1,3})*[0-9]{4,10}$/', $str) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/DKoG5
function name:  (null)
number of ops:  44
compiled vars:  !0 = $str
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'QR12345678'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_match'
          3        SEND_VAL                                                 '%2F%5E%5BA-Z%5D%7B1%2C3%7D%5B0-9%5D%7B4%2C10%7D%24%2F'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        SEND_VAR                                                 $2
          7        DO_ICALL                                                 
    6     8        INIT_FCALL                                               'var_dump'
          9        INIT_FCALL                                               'preg_match'
         10        SEND_VAL                                                 '%2F%5E%5BA-Z%5D%7B1%2C3%7D%3F%5B0-9%5D%7B4%2C10%7D%24%2F'
         11        SEND_VAR                                                 !0
         12        DO_ICALL                                         $4      
         13        SEND_VAR                                                 $4
         14        DO_ICALL                                                 
    7    15        INIT_FCALL                                               'var_dump'
         16        INIT_FCALL                                               'preg_match'
         17        SEND_VAL                                                 '%2F%28%5BA-Z%5D%7B1%2C3%7D%29%3F%5B0-9%5D%7B4%2C10%7D%24%2F'
         18        SEND_VAR                                                 !0
         19        DO_ICALL                                         $6      
         20        SEND_VAR                                                 $6
         21        DO_ICALL                                                 
    8    22        INIT_FCALL                                               'var_dump'
         23        INIT_FCALL                                               'preg_match'
         24        SEND_VAL                                                 '%2F%5E%28%5BA-Z%5D%7B1%2C3%7D%29%3F%5B0-9%5D%7B4%2C10%7D%24%2F'
         25        SEND_VAR                                                 !0
         26        DO_ICALL                                         $8      
         27        SEND_VAR                                                 $8
         28        DO_ICALL                                                 
    9    29        INIT_FCALL                                               'var_dump'
         30        INIT_FCALL                                               'preg_match'
         31        SEND_VAL                                                 '%2F%5BA-Z%5D%7B0%2C3%7D%5B0-9%5D%7B4%2C10%7D%2F'
         32        SEND_VAR                                                 !0
         33        DO_ICALL                                         $10     
         34        SEND_VAR                                                 $10
         35        DO_ICALL                                                 
   10    36        INIT_FCALL                                               'var_dump'
         37        INIT_FCALL                                               'preg_match'
         38        SEND_VAL                                                 '%2F%28%5BA-Z%5D%7B1%2C3%7D%29%2A%5B0-9%5D%7B4%2C10%7D%24%2F'
         39        SEND_VAR                                                 !0
         40        DO_ICALL                                         $12     
         41        SEND_VAR                                                 $12
         42        DO_ICALL                                                 
         43      > RETURN                                                   1

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