/(?:sudden|unexpected)? death(?! benefits)|deceased|passedaway|died|dying/

##</code><code>##

/^(?!.*death benefits).*(?:(?:sudden|unexpected)? death(?! benefits)|deceased|passedaway|died|dying)/

##</code><code>##

!/death benefits/ && /(?:sudden|unexpected)? death(?! benefits)|deceased|passedaway|died|dying/