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<?php $a = 'hello,[how]. please don\'t remove[are]you?'; echo preg_replace('#\s*\[.+\]\s*#', ' ', $a); echo preg_replace('~\h*\[(?>[^][]++|(?R))*+]\h*~', ' ', $a);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Av3jU
function name:  (null)
number of ops:  14
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'hello%2C%5Bhow%5D.+please+don%27t+remove%5Bare%5Dyou%3F'
    4     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%23%5Cs%2A%5C%5B.%2B%5C%5D%5Cs%2A%23'
          3        SEND_VAL                                                 '+'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
    5     7        INIT_FCALL                                               'preg_replace'
          8        SEND_VAL                                                 '%7E%5Ch%2A%5C%5B%28%3F%3E%5B%5E%5D%5B%5D%2B%2B%7C%28%3FR%29%29%2A%2B%5D%5Ch%2A%7E'
          9        SEND_VAL                                                 '+'
         10        SEND_VAR                                                 !0
         11        DO_ICALL                                         $3      
         12        ECHO                                                     $3
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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