Help with regular expression
 

To prevent spambots from registering I have added an extra required profile question. It is a free form text field which contents I manually verify and based on the content accept or delete the new member.

Currently I have no regular expression added for the field which means that anything in the field lets the spambot save the registration.

What I have determined is that the bots always puts the same into the field and I have so far seen 2 different texts.

So now I want to add an expression that accomplish following:

- must not be text1
- must not be text2
- must contain at least 5 different words

Can someone help me with this ?