Sorry for not mentioning the programming language.  I am using PHP.  

 But the above examples still do not specifically match strings that have three consecutive letters, instead they just see if there are three letters in that string and then print that string if therer is a match.  

 Again, what would be the regex for matching strings that contain 3 consecutive letters like, "addddkdadf", "aaakdkdr", and "kekeee".   Thank you so much for any help so far.

Sincerely,
Ryan