#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?mi)([{,])(\w+)(\s+)?:"
Local $sString = "[{endTime:"2019-06-05T17:15:00.000+10:00",startTime:"2019-06-05T17:00:00.000+10:00"}]"
Local $sSubst = "$1"$2":"
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