For the other readers, here is a snippet of the index: 
Anna Karenina, by Lev Nikolaevica Tolstoi                             
+   13214
  [Language: Dutch]
Night Before Christmas & Other Popular Stories For Children, by Variou
+s  13213
The Wild Olive, by Basil King                           13212
The Pearl, by Sophie Jewett                             13211
El Comendador Mendoza, by Juan Valera                   13210
  [Subtitle: Obras Completas Tomo VII]
  [Language: Spanish]

[download]
It seems that there is a good bit of structure here. Each new entry starts on a new line. The title and author are separated by /, by/. The ID is at the end of the first line of the entry. Combining these, a first stab at a regexp would be 
$line =~ /^(\w.*?), by (.*?)\s+(\d+)$/;
$author = $1;
$title = $2;
$id = $3;

[download]

-Mark

In reply to Re: Parsing Gutenberg Catalog Index by kvale
in thread Parsing Gutenberg Catalog Index by hacker

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