Parsing values from a column while excluding certain values from other column - google-sheets

Question

I have two columns of values of which the second includes a subset of the first. I'm parsing partial matches from the first column with:
=query(A:A, "select A where A ends with 'x'")
It works fine. How would you modify it in order to exclude the shared values?
Here's an example:
A is where we're parsing from, B is the subset we want to discard, C would be the desired result:
filter values to exclude common values with column B
return only values ending in 'x'

Answer 1

Edit
To solve this, you first may need to exclude values from column B, then query result to match only pattern '%x'. Try this formula:
=QUERY(FILTER(A:A,REGEXMATCH(A:A,JOIN("|",FILTER(B:B,B:B<>"")))=false),
"select Col1 where Col1 like '%x'")
Edit #2
Special symbols for regular expressions are \ + * ? [ ^ ] $ ( ) { } = ! < > | : -
If such symbols are met in your data, you need to escape them by \ in order to use regular expressions. So formula REGEXMATCH in this case won't work properly if column B contains special symbols. Possible solution is to replace them like this: [symbol] → [\symbol]. For example, to replece ():
=REGEXREPLACE(text ;"(\(|\)|\*)";"\\$1")
Try using this formula in column C to get the result:
=QUERY(FILTER(A:A,REGEXMATCH(A:A,
REGEXREPLACE( JOIN("|",FILTER(B:B,B:B<>""));"(\(|\)|\*)";"\\$1"))=false),
"select Col1 where Col1 like '%x'")
Original answer
may be using not keyword will work:
=query(A:A, "select A where not A ends with 'x'")
the same as:
=query(A:A, "select A where not A like '%x'")