#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m)(?:^|[^>])(Cass\.\s+com\.(?:,\s+(?:avis|QPC))?,\s+(\d{1,2})e?r?(?:\s| )+(\w+\.?)\s+(\d{4}),\s+n(?:°|°|o)s?(?:\s| )+(\d{2}-\d{2})\.?(\d{3}))"
Local $sString = ".Cass. com., 5 janvier 2012, n° 12-45.644"
Local $sSubst = "<renvoi type="CASS" refid="$5$6" jour="$2" mois="$3" annee="$4">$1</renvoi>"
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