#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?mi)<svg[^>]+>"
Local $sString = "<!-- Generator: Adobe Illustrator 23.0.2, SVG Export Plug-In -->" & @CRLF & _
"<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="53.5px"" & @CRLF & _
" height="42.8px" viewBox="0 0 53.5 42.8" style="enable-background:new 0 0 53.5 42.8;" xml:space="preserve">" & @CRLF & _
"<style type="text/css">" & @CRLF & _
" .st0{fill:#C49039;}" & @CRLF & _
"</style>" & @CRLF & _
"<defs>" & @CRLF & _
"</defs>" & @CRLF & _
"<path class="st0" d="M53.5,21.4C53.5,8.6,44.2,0,28.4,0H0v42.8h28.4C44.2,42.8,53.5,33.9,53.5,21.4z"/>" & @CRLF & _
"</svg>" & @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