#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?im)(?:(?<!\S)(?:VON|VAN|DE)|\G(?!\A)\S+)\K\x20"
Local $sString = "HENRIETTA VON DER GRAAF" & @CRLF & _
"CAROLINE VAN OOSTEN DE WINKEL" & @CRLF & _
"MARC DE VRIES VAN JONG" & @CRLF & _
"ANNEKA VANHOVEN BAKKER" & @CRLF & _
"JOHN SMITH"
Local $sSubst = "-"
Local $sResult = StringRegExpReplace($sString, $sRegex, $sSubst)
MsgBox($MB_SYSTEMMODAL, "Result", $sResult)
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for AutoIt, please visit: https://www.autoitscript.com/autoit3/docs/functions/StringRegExp.htm