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Also known as: subject regex, header parsing
How an indexer turns raw Usenet subject lines into usable entries, applying regular expressions to strip part counters, yEnc markers and filenames until a release name remains. Posters vary their subject formats constantly and some deliberately obfuscate them, so parsing rules need frequent updating. A failed parse leaves a posting either unlisted or listed under a garbled name that no search will match.
Browse all terms in NZB Files & Indexing, or see the full Usenet glossary.