#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m)^(\+\b33|\b0)[67][0-9]{8}$"
Local $sString = "+33611223344+33611223344" & @CRLF & _
"0611223344 0744332211" & @CRLF & _
"0744332211+33611223344" & @CRLF & _
"0744332211 +33611223344" & @CRLF & _
"0611223344" & @CRLF & _
"0744332211" & @CRLF & _
"+33611223344" & @CRLF & _
"+33744332211" & @CRLF & _
"06112233440744332211"
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