how to use grep to match with either whitespace or newline

Question

I want to grep a file with a word, say \"AAA\", and it ends with whitespace or newlines. I know how to write this seperately, as follows, but having problems in combining th

Answer 1

If you are looking for word AAA followed by space anywhere in the string, or at the end of line, then use

grep -P "AAA( |$)"