You can use ALINES() in combination with ASORT()

lcStr = "UG-1542,UB-8473,UY-9115,UB-2121"
= ALINES(laList, lcStr,1, ",")
= ASORT(laList, -1,-1,0)
? laList[1]

>
>
>I have comma delimited string variable and I have to retrieve only one value by ABC Sequential Order priority (each value start with U, so I have to see ignore the U).
>
>For example:
>
>1. UR-6542,UG-4586,UA-5585,UF-8522 = UA-5585
>2. UG-1542,UB-8473,UY-9115,UT-7741 = UB-8473
>3. UG-1542,UB-8473,UY-9115,UB-2121 = UB-2121 (I have two B so order by digits).
>
>Tnx