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<?php $string = "You may organize to find or seek a neighbor or a pastor in a harbor or orchard."; echo preg_replace('~(?<!\bor) (?!or\b)~', '_', $string);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qctm7
function name:  (null)
number of ops:  8
compiled vars:  !0 = $string
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'You+may+organize+to+find+or+seek+a+neighbor+or+a+pastor+in+a+harbor+or+orchard.'
    3     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%7E%28%3F%3C%21%5Cbor%29+%28%3F%21or%5Cb%29%7E'
          3        SEND_VAL                                                 '_'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        ECHO                                                     $2
          7      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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