\ban ASCII word boundary
whetherthe literal text whether (case sensitive) \s+any whitespace character, repeated at least once
orthe literal text or (case sensitive) \s+any whitespace character, repeated at least once
notthe literal text not (case sensitive) \s+any whitespace character, repeated at least once
applethe literal text apple (case sensitive) \ban ASCII word boundary
(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character
(*F)forces the current match attempt to fail at this position