To reiterate what idsfa said, we need to know what you have tried, what the record separators are, etc, etc. Just generally more information.

That being said, you could always load each record into a variable (hash or array). Then pass that variable off to a function that checks the data for inconsistancies, or whatever you are looking for. Removes whatever needs to be removed (since manipulating a hash or array is simple if the structure doesn't change), and then return the new variable to the main program. Obviously this can also be done via an OO method (and this is likely preferred since this sounds to be repetative data).