excel formula to get last character

i need help how to get last character using excel formula
below is my list

a1.b_12
a2.c_1
abd.c_23

to become

12
1
23

thanks

If there's always going to be an underline in the text, and just one underline then the formula is (with the original value in cell A1)

=MID(A1,FIND("_",A1")+1,255)

Originally Posted by royUK

12 is not the last character, it's the last two. Do you mean after _

yes last two after_