#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m)^(?:(“(?! “).*?)\s*”|(“) “(.*)|((?!“).*?)\s*”)$"
Local $sString = "“ Criteria 1, ending with RD and beginning with LD, but not LDLD, remove RD ”" & @CRLF & _
"“ “ Criteria 1, ending with RD but beginning with LDLD, do nothing to RD ”" & @CRLF & _
"“ “ Criteria 2, beginning with LDLD, make it begin with LD ”" & @CRLF & _
"Criteria 3 with non-matching RD, remove RD ”"
Local $sSubst = "$1$2$3$4"
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