title: NLP: Extracting only specific sentence of whole text in R
body: <p>I have the multiple rows of text data(different document) and each row has around 60-70 lines of text data(more than 50000 characters). But of these my area of interest is only on 1-2 rows of data, based on keywords. I want to extract only those sentences where the keyword/group of words are present. My hypothesis is that by extracting only that piece of information, I can have a better POS tagging and understand sentence context better as I am only looking at sentence that I need. Is my understanding correct and how can we accomplish this in R apart from using regex and full stops. This might be computationally intensive.</p>
  
  <p>Eg:
  The Boy lives in Miami and studies in the st. Martin School.The boy has a heiht of 5.7" and weights 60 Kg's. He has intrest in the Arts and crafts; and plays basketball..............................................
  ..................................................................</p>
  
  <p>I just want to extract the sentence "<em>The Boy lives in Miami and studies in the st. Martin School</em>" based on key word study (stemmed keyword).</p>