Formula to return the position of the last occurent character

[Xalova]

The title can be a bit hard to understand. English isnt my native language, so i am sorry.

What i meant is this:
I have a Cell with a value of, lets say, "1,2,3".
Now i want the position of the last comma. In this case it would be the Position 4.

How can i search for it with a formula?

 

[Xalova]

The title can be a bit hard to understand. English isnt my native language, so i am sorry.

What i meant is this:
I have a Cell with a value of, lets say, "1,2,3".
Now i want the position of the last comma. In this case it would be the Position 4.

How can i search for it with a formula?

I forgot to add what i need this formula for.
i want to achieve that i get the cell value up until the last occurance of the character of my chosing, So for this Example (with the cellvalue of "1,2,3") i want to get the value "1,2," or "1,2" whatever is easier. Works both for me

 

[Tupe77]

Do you mean something like this?
This formula use E1 cell as source, change it.

=LEFT(E1,FIND("@",SUBSTITUTE(E1,",","@",LEN(E1)-LEN(SUBSTITUTE(E1,",",""))),1)-1)

 

[Xalova]

Do you mean something like this?
This formula use E1 cell as source, change it.

=LEFT(E1,FIND("@",SUBSTITUTE(E1,",","@",LEN(E1)-LEN(SUBSTITUTE(E1,",",""))),1)-1)

exactly, thank you