excel find nth character from end of string code example

Example 1: excel formula find 2nd occurrence in string

To find the 2nd backslash in the text in cell A1:
=SEARCH("^", SUBSTITUTE(A1, "\","^",2))

To find the 4th period in the text in cell A1:
=SEARCH("^", SUBSTITUTE(A1, ".","^",4))

Example 2: excel find position of second to last character in a string

=FIND(CHAR(160),SUBSTITUTE(text,"@",CHAR(160),N))