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: simply putting

: \bCK\b

: is now working

: Getting frustrated over:

: Allowing posts about a tube or tubes of a product but do not want
: somethingtube (a lot of this)

\b\S+(tube|tubes)\b

matches somethingtube and somethingtubes

: also tubesomething (less common) without stopping posts about tubes

\btube[^s ]\S+\b

\btubes[^s ]\S+\b

\btubess[^s ]\S+\b

Please report back if the matchings work as expected.
Problem is catching the single 'tube' with something and the 'tubes' with something and the "s" as the possible next character to the tube/s

However, I guess the 4 items above should work.

Enjoy and report back