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<?php $html = '<b>smth</b> smth <b>smth</b>'; var_dump(!preg_match('|</b>.*[A-zА-яЁё0-9]+.*<b|', $html));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Luqct
function name:  (null)
number of ops:  10
compiled vars:  !0 = $html
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%3Cb%3Esmth%3C%2Fb%3E+smth+%3Cb%3Esmth%3C%2Fb%3E'
    5     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_match'
          3        SEND_VAL                                                 '%7C%3C%2Fb%3E.%2A%5BA-z%D0%90-%D1%8F%D0%81%D1%910-9%5D%2B.%2A%3Cb%7C'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        BOOL_NOT                                         ~3      $2
          7        SEND_VAL                                                 ~3
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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