Split cells not importing first 0

Question

I am using split formula:

=IFERROR(SPLIT(REGEXREPLACE(" , "&U4,  "(\d)",  "$1 ,"),  ",  "))

It works great except if I have 0250, it imports it across as 250, even with the cell it's importing from is set to #000 and it sits in the 1st 3 cells instead of the 2nd 3rd and 4th cells

When the number is 1250 it works fine, but if it's 0250 then it comes through as 250 not 0250

Answer 1

=IFERROR(REGEXEXTRACT(""&A2, REPT("(.)", LEN(A2))), 
         REGEXEXTRACT( 0&A2, REPT("(.)", LEN(A2))))