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A phrase search would be nice,
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I would LOVE to know how google does this so fast.
The obvious way to do it is slow: search for each keyword of a phrase separately, then do a (slow) full text search of those posts to see which ones have the exact phrase.
Maybe they save each word index entry as a (word, documentid, word offset) triplet. That would allow them to quickly compute offset differences, but would require a gargantuan amount of storage for indexing common words.
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The search functionality of Google with the display modes of vB... that would be best.
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Dear Buddha, please bring me a pony and a plastic rocket.