Подскажите по регулярочке

(?!(word1|word2|word3)\b)\b\w+

$ cat djnoob
#!/bin/bash

read -a words

for i in "${!words[@]}"; do
    if [[ ${words[$i]} =~ word1|word2|word3 ]]; then
        unset "words[$i]"
    fi
done

echo "${words[@]}"

$ ./djnoob <<< 'My super string word1, hello word2 word yes word3 the bestr'
My super string hello word yes the bestr