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<?php $pattern1 = '/^[0-9_\p{L}\p{Cyrillic}]+$/u'; var_dump(preg_match($pattern1, 's')); var_dump(preg_match($pattern1, 'S')); # https://regex101.com/r/F5JvPD/1
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/bqsue
function name:  (null)
number of ops:  16
compiled vars:  !0 = $pattern1
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%2F%5E%5B0-9_%5Cp%7BL%7D%5Cp%7BCyrillic%7D%5D%2B%24%2Fu'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_match'
          3        SEND_VAR                                                 !0
          4        SEND_VAL                                                 's'
          5        DO_ICALL                                         $2      
          6        SEND_VAR                                                 $2
          7        DO_ICALL                                                 
    6     8        INIT_FCALL                                               'var_dump'
          9        INIT_FCALL                                               'preg_match'
         10        SEND_VAR                                                 !0
         11        SEND_VAL                                                 'S'
         12        DO_ICALL                                         $4      
         13        SEND_VAR                                                 $4
         14        DO_ICALL                                                 
    8    15      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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