#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "{\K(?:[^,}]*,){13}"
Local $sString = "{1,1,0,0,0,4,0,0,0,0,20,4099,4241,706,706,714,714,817,824,824,824,2,2,2,2,1,1,1,1},"
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