How to crack md5 hash where long cleartext is *almost* known?

[mastercracker]

Look at http://hashcat.net/wiki/doku.php?id=rule_based_attack
The rule would be:

Code:

s!? TB TJ i9n

That's very specific but the goal here would to create the most common variant as a wordlist and then use rules on them:

Code:

this is a example string?
This is a example string?
This Is A Example String?
THIS IS A EXAMPLE STRING?
...