Cmake string to get key value pairs from a string list containing key values separated by colon

I have a stringlist (input):

set(MY_LIST "A:1;B:2;C:3")

I want to fetch the key values using foreach and set them as cmake constants. Something like:

foreach(ITEM ${MY_LIST})
   SET(<ITEM_A> <value_ofA>)
endforeach()

So basically i want the end result as but this should be achieved using a forloop:

SET(A "1")
SET(B "2")
SET(C "3")

How can i achieve this by using foreach to navigate each string in my list and set the key value pairs as cmake constants?

This is not so bad:

cmake_minimum_required(VERSION 3.21)

set(MY_LIST "A:1;B:2;C:3;D:foo:bar")
foreach (pair IN LISTS MY_LIST)
  string(FIND "${pair}" ":" pos)
  if (pos LESS 1)
    message(WARNING "Skipping malformed pair (no var name): ${pair}")
  else ()
    string(SUBSTRING "${pair}" 0 "${pos}" var)
    math(EXPR pos "${pos} + 1")  # Skip the separator
    string(SUBSTRING "${pair}" "${pos}" -1 val)
    set("${var}" "${val}")
  endif ()
endforeach ()

message(STATUS "${A}")
message(STATUS "${B}")
message(STATUS "${C}")
message(STATUS "${D}")

The output is:

$ cmake -P test.cmake
-- 1
-- 2
-- 3
-- foo:bar

Might work on earlier versions, too. I keep up to date.