The INDEX and MATCH formula explained here is meant forlegacy versions of Excelthat do not provide the FILTER function.
The second argument, 6, is an option to ignore errors.
The third argument is an expression that generates an array of matching results (described below).
The clever bit is to divide the row numbers by the search results.
In a math operation like this, TRUE behaves like 1, and FALSE behaves like zero.
For a detailed explanation,see this page.
it’s possible for you to use INDEX to retrieve individual values, or entire rows and columns.
SEARCH Function
The Excel SEARCH function returns the location of one text string inside another.
SEARCH returns the position offind_textinsidewithin_textas a number.
SEARCH supports wildcards, and isnotcase-sensitive….