#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m),([^,]*)$"
Local $sString = "http://stackoverflow.com/questions/3829483/how-to-replace-last-occurrence-of-characters-in-a-string-using-javascript" & @CRLF & _
"DailyStats,jlaer;priatil;uido,DailyStatsAdm" & @CRLF & _
"AuditEvents,aorl;atil;le;mran;uido,AuditEventsAdm" & @CRLF & _
""
Local $sSubst = ";$1"
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