#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "<img [^>]*?src=["\']data:image/svg\+xml[^>]+>"
Local $sString = "<div>" & @CRLF & _
"<img class="bumbum"><img src="data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="960" height="640"%3E%3C/svg%3E" />" & @CRLF & _
"</div>"
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