#include <MsgBoxConstants.au3> ; to declare the Constants of MsgBox
Local $sRegex = "(?m)(\(([^(){},]+|\((?:[^(),]+,[^(),]+)\)|({(?:[^{}]+|(?-1))++}))(?:,(?2))+),"
Local $sString = "Should work for:" & @CRLF & _
"(1,2,3)" & @CRLF & _
"(1,2,3,4)" & @CRLF & _
"((1,2),3,4)" & @CRLF & _
"(((1,2,3),4),5)" & @CRLF & _
"({x},{y},{z})" & @CRLF & _
"(1,(2,3),4)" & @CRLF & _
"((1,2),(3,4),5)" & @CRLF & _
"((1,2),3,(4,5))" & @CRLF & _
"(1,(2,(3,4),5))" & @CRLF & _
"(1,(2,({3},4),5))" & @CRLF & _
"(1,{{1},{1,2}},3)" & @CRLF & _
"" & @CRLF & _
"Should not work for:" & @CRLF & _
"(1,2)" & @CRLF & _
"(10,10)" & @CRLF & _
"(1,10)" & @CRLF & _
"((1,2),3)" & @CRLF & _
"(((1,1),1),1)" & @CRLF & _
"({0},1)" & @CRLF & _
"({{x},{x,y}},z)"
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