The Filter Array action is nearly impossible to use, at least for me, because every time I type a character, the cursor jumps to the first character position. I assume the interns will never fix this bug, so I always use Notepad to craft the filter, paste it into the Advanced window, and then hope for the best.
Also, the syntax is fairly obtuse, as it's a reverse Hungarian notation, or some other pain in the ass that's unintuitive.
For example:
x= 5 and y <> 1
is crafted as:
and(equals(x, 5), not(equals(y, 1))
So, it will take 3 or 4 hundred tries to get the syntax correct before you find the proper way to extract your desired item from the array.
Post more info as desired, if you'd like a more specific answer.