Find a value in a range of cells as a substring

Question

On tab 1, I have a column where each cell in that column has a group of numbers, and another column where that group of numbers is associated with a name. Example:

Answer 1

In order to achieve a true match, you must enforce the condition that each value looked for will begin and end with a comma. This string concatenation together with the wildcards will necessitate an array formula.

       

The array formula in E1 is =INDEX('Tab 1'!$B$1:$B$4,MATCH("*,"&D1&",*",","&'Tab 1'!$A$1:$A$4&",",0)). This requires Ctrl+Shift+Enter rather than simply Enter. Once entered correctly, it can be filled down as necessary. You may wish to apply an IFERROR wrapper to show an empty string instead os #N/A.

Answer 2

Entered as an array formula (Ctrl-Shift-Enter) and copied down, this works:

=INDEX($B$1:$B$4,MATCH(TRUE,ISNUMBER(SEARCH(","&D8&",",","&$A$1:$A$4&",")),0))