#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m)^(?:\+971|00971|0)?(?:50|51|52|55|56|2|3|4|6|7|9)\d{7}$"
Local $sString = "00971551234567" & @CRLF & _
"+971551234567" & @CRLF & _
"+97141234567" & @CRLF & _
"0551234567" & @CRLF & _
"041234567" & @CRLF & _
""
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