analyzing a text and copy lines

[Larz60+]

Please clearly describe exactly what you are trying to do.
Include:

• Your Goal very clearly please.
  
• What the data is comprised of, it's format, and special information that is known.
  

I get all the classtype's values in an array but I don't know how to copy all the lines that satisfies the condition. Any help or clue?

means nothing without above