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plurals

POFastest way/algorithm to find one different keyword between two set of text files
primarykey
Id
718098
data
AcceptedAnswerId
718125
AnswerCount
3
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2009-04-05T00:12:09.577
FavoriteCount
0
LastActivityDate
2012-07-22T08:14:01.180
LastEditDate
2012-07-22T08:14:01.180
LastEditorUserId
812149
OwnerUserId
40322
ParentId
0
PostTypeId
1
Score
1
ViewCount
884
LastEditorDisplayName
Slough
text
Body
I've got 4 text files, 2 of them contains a keyword which other 2 text files don't. What's the fastest way/algorithm to find this "keyword" shared in the first 2 text files but don't exist in the other 2 files? I can think of really slow ways such as go word by word and then search with IndexOf etc. But sounds like it's going to be really slow. Especially if the file number increases. Extra 1 : Keywords can be a single word such as "apple" or a sentence "Have you seen the apple tree?". As soon as other two text files doesn't include this keyword it doesn't matter. But I assume performance wise shorter would be better. Extra 2 : These text files actually simple HTML sources therefore expected to be big.
Tags
<.net><algorithm><diff>
Title
Fastest way/algorithm to find one different keyword between two set of text files
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PostAcceptedAnswerId
1. PO
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1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USS.L. Barth
UserOwnerUserId
1. USdr. evil
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1. PO
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2. PO
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3. PO
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VotesPostIdCreationDate
1. VO
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 POFastest way/algorithm to find one different keyword between two set of text files
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