#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?:(['"])(?>\\\1|(?!\1)[\w\W])*\1|\/\*[\w\W]*?\*\/)(*SKIP)(*F)|\h*\/\/.*+"
Local $sString = ""Testing a comment here // comment" // comment" & @CRLF & _
"" & @CRLF & _
"// comment" & @CRLF & _
"" & @CRLF & _
""A bit \" trickier yet \" // comment" // comment" & @CRLF & _
"" & @CRLF & _
"// comment" & @CRLF & _
"" & @CRLF & _
"// "This should match since the comment came first"" & @CRLF & _
"" & @CRLF & _
"'Single \' quotes // comment' // comment" & @CRLF & _
"" & @CRLF & _
"'''" & @CRLF & _
"Ignore" & @CRLF & _
"// comment" & @CRLF & _
"\''''" & @CRLF & _
"" & @CRLF & _
"// comment" & @CRLF & _
"" & @CRLF & _
"/*" & @CRLF & _
"multiline" & @CRLF & _
"// comment" & @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