search algorithms for searching a body of text

Im looking for an efficent search algorithm which searches a body of text (under 3,000 words) looking for keywords.

What would be the best algorithm to employ.

The body of text may be a XML document (in which case id like to be able to search the XML elements eg search for 'Alan Turing' in the element tag author)

Thanks in adavance for any pointers
mellowmooseAsked:
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mellowmooseAuthor Commented:
To clarify a few points.

The document will be one ive never seen before.

I'd prefer to be able to search the XML b4 I parse it (if the keyowrds dont match then XML doc will not be (parsed)

Ill be using DOM parsing.

Thanks
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sunnycoderCommented:
Hi mellowmoose,

since you are searching only under 300 words, even linear search should be fast enough on todays hardware

however, if you do wish take the troble of implementing efficient algorithms, I would recommend Aho Corasick algorithm

you can see a demo here
http://www-sr.informatik.uni-tuebingen.de/~buehler/AC/AC1.html

details of the algorithm
http://courses.cs.vt.edu/~algnbio/algnbio_2001/lectures/AhoCorasick.html

Cheers!
Sunny:o)
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