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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:  5
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        FRAMELESS_ICALL_3                preg_replace        ~2      '%7E%28%3F%3C%21%5Cbor%29+%28%3F%21or%5Cb%29%7E', '_'
          2        OP_DATA                                                      !0
          3        ECHO                                                         ~2
          4      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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