#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = ".*(:2(\[(((\d*,){3})\]))).*"
Local $sString = ":1[2,2,2,]:2[0,14,88,]:homebase[7,4,1776,]:"
Local $sSubst = "$4"
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