#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m)^"[^"\\]*(?:\\.[^\"\\]*)*"$|^'[^'\\]*(?:\\.[^'\\]*)*'$|^\s*["'][^"'\\]*|["']\s*$|\\.|(["'])[^"'\\\n]*"
Local $sString = ""Some Text"" & @CRLF & _
""Some more Text"" & @CRLF & _
""Even more text about \"this text\""" & @CRLF & _
""Ol' 8 o'clock"" & @CRLF & _
"'8 o'clock'" & @CRLF & _
" '8 o'clock'" & @CRLF & _
"'Ol' 8 o'clock'" & @CRLF & _
"""B"" & @CRLF & _
""\"B"" & @CRLF & _
""\\"B"" & @CRLF & _
""\\\"B"" & @CRLF & _
""\\\\"B""
Local $sSubst = "\\$1"
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