Matching a single value to a possible value in another table?

[SHDJason]

Hi. I have been trying to figure this out and I finally give up. 

Here is the situation:

I have a table of website traffic with a long list of full URLs.

I have another very short table with list of root domains that we are focusing on.

I would like to create a new column in the first table that flags where the URL matches the second table. It does not need to be an exact match, just a root domain match.

The problem that I am stuck on is that the FIND function only accepts a single value to match to, it does not iterate through a list of possible matches.

FIND("single expression", [URL]).  Where I need "single expression" to iterate through a list of possible values.

I thought nesting the FIND function inside a FILTER function to compare one row at a time would work, but I get stuck on one value and it does not iterate through the list of possible matches.

All the iterating functions that I could find are good for math, but not for text or logic functions.

Maybe there is a way to do this in M using the Text.Contains function?

I'm sure there is a simple way to do this that I'm just not understanding. I appreciate any help. Thanks. 

[Anonymous]

You can do this in dax.

You can use FIRSTNONBLANK combined with a filter:

FIRSTNONBLANK(FILTER(VALUES('Table to Search'[Field]),SEARCH('Table to Search'[Field],'Table with Main Data'[Field],1,0)),1)

[SHDJason]

Thanks @Anonymous!  

I actually woke up in the middle of the night with this solution:

IF(COUNTROWS(FILTER(Mentions,IFERROR(SEARCH([Source],[Url]),BLANK())))>1,TRUE(),FALSE())

Which works, but I think yours is more elegant!  

For some reason I need to wrap my SEARCH and FIND functions in IFERRROR because I keep getting errors on the not found value.