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<?php $subject = 'все кроме ямайка и так далее'; $result = preg_replace('/(\s)?ямайка(?(1)|\s?)/x', '', $subject); echo $result;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MgUja
function name:  (null)
number of ops:  9
compiled vars:  !0 = $subject, !1 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%D0%B2%D1%81%D0%B5+%D0%BA%D1%80%D0%BE%D0%BC%D0%B5+%D1%8F%D0%BC%D0%B0%D0%B9%D0%BA%D0%B0+%D0%B8+%D1%82%D0%B0%D0%BA+%D0%B4%D0%B0%D0%BB%D0%B5%D0%B5'
    3     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%28%5Cs%29%3F%D1%8F%D0%BC%D0%B0%D0%B9%D0%BA%D0%B0%28%3F%281%29%7C%5Cs%3F%29%2Fx'
          3        SEND_VAL                                                 ''
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $3      
          6        ASSIGN                                                   !1, $3
    5     7        ECHO                                                     !1
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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