#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(\w)(nin)\b"
Local $sString = "yilanin" & @CRLF & _
"suyunin" & @CRLF & _
"kalinin" & @CRLF & _
"batinin" & @CRLF & _
"kinindan" & @CRLF & _
"sininteki" & @CRLF & _
"nin" & @CRLF & _
"ninkisi" & @CRLF & _
"xxxnin" & @CRLF & _
"xxxninxxx" & @CRLF & _
"nin"
Local $sSubst = "$1NG"
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