I need help for a fitting regular expression.

I need help for a fitting regular expression.
I can do this ...

$regexp('TT000 A TT1 B C TT22 D TT333 E TT4444 F G H TT55555','(?:^|\s)TT.+?(?>(?:\s|$))',' ') ==> ' A B C D E F G H '

How to negate the above regular expression to get the following result?

==> 'TT000 TT1 TT22 TT333 TT4444 TT55555'

Thanks in advance.

DD.20140430.1212.CEST

This is probably much too simple but...
$regexp(%albumartist%,'[A-Z]\s',' ')

"TT000 A TT1 B C TT22 D TT333 E TT4444 F G H TT55555" ->
"TT000 TT1 TT22 TT333 TT4444 TT55555"

'ohrenkino', thank you for helping me, but the example cannot be taken literally as is.
The given list of items is a list of random words, having here and there similar words with different length, but with the same word stem. I want to get the list of the words from this word family.

DD.20140430.1718.CEST