How to Check if strings in an array contain strings from another array

Question

Main Question :
Ok guys, here is the situation, let's consider 2 string arrays :

string foo = { "Roses are #FF0000" , "Violets are #0000FF", "Paint it #000000"}
string bar = { "Guns", "Roses", "Violets"}

What is the "fewest code lines" way to retrieve strings in foo containing strings in bar ?
(i.e, in this case, the 2 first elements of foo)

Of course I want to avoid doing all the logic "by hand" as I am sure Linq is more efficient with the intersect feature, but I do not know how to use it to perform this precise task.

TieBreakers :
1 - What if foo contains strings that contain more that one element of bar,

string foo = { "Roses are #FF0000" , "Violets are #0000FF", "Paint it #000000"}
string bar = { "Roses", "Violets", "are"}

And I want to avoid duplicates ?

2 - What if I have 2 "bar" arrays that I want to check against one foo array ?
Is it more efficient to merge bar1 and bar2 or to perform the filter with bar1 first and then with bar2 ?

Thanx and have fun answering :-)

Answer 1

LINQ works well, yes:

var mixed = foo.Where(x => bar.Any(y => x.Contains(y));

Note that you'll still only see each element of foo once, if at all.

If you have multiple bar arrays, you can use:

var mixed = foo.Where(x => bar1.Concat(bar2)
                               .Any(y => x.Contains(y));