Another alternative that I often see used here is to calculate the position and length of each unit within the file as you are scanning through it looking for markers. Put the marker-name, position, and length into an array of hashes, then sort the array by name using a custom sort-function. Retrieve each chapter directly from the original file by seeking to the proper position and reading the calculated number of bytes. (If the length might also be huge, read and write it in chunks not-to-exceed a digestible buffer-size.)
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