Higher-Order Perl Professional Indexer Quiz

Do you have what it takes to be a professional indexer? Identify the key phrase in the following sentence that the professional indexer chose to list in the index and you could win a chance to index Mark's next book!

The correct answer is a contiguous substring of the sentence below. You have three guesses.

When the most recent input is itself a token, passed up from some lower-level lexer, we know that the following characters aren't part of this token, so we can examine the current text in the same way as if it were at the end of the input.

Enter your guess here: