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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:  10
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        FRAMELESS_ICALL_2                preg_match          ~2      !0, 's'
          3        SEND_VAL                                                     ~2
          4        DO_ICALL                                                     
    6     5        INIT_FCALL                                                   'var_dump'
          6        FRAMELESS_ICALL_2                preg_match          ~4      !0, 'S'
          7        SEND_VAL                                                     ~4
          8        DO_ICALL                                                     
    8     9      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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