I need to take a array of URL's in @A, compare it to a array of "banned" domain names in @B, and either remove matches from @A, or put non-matches into a new array, @C. Given example data: 
 @A = ( 'yahoo.com', 'altavista.com', 'yahoo.com/index.html' );
 @B = ( 'yahoo.com', 'webcrawler.com' );

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@A (or @C) should end up with only 'altavista.com'. Clearly, it is has to match with patterns, not just exact string equality.

Originally posted as a Categorized Question.

In reply to How Do I Compare Array A to Array B, removing B elements from A. by fuzzball

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