Thank a lot,
But could you tell me what you use.
noun_phrase
     :: (adjective*) noun prepositional_phrase
  prepositional_phrase
     ::  preposition [article] noun_phrase

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looks like regular expressions on parts of speach to create word chunks.

In reply to Re^2: Keywords and keyphrases extraction from text by vit
in thread Keywords and keyphrases extraction from text by vit

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