extract a linguistic structure based on POS tagged sentence using Stanford nlp in JAVA

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I am new in NLP, I want to do POS tagging and then do find a specific structure within a text. I could manage POS tagging using Stanford NLP but, I can not extract the structure: NN/NNS +IN+DET+NN/NNS/NNP/NNPS

public static void main(String args[]) throws Exception
 //input File
 String contentFilePath = "";
 //outputFile
 String triplesFilePath = contentFilePath.substring(0, contentFilePath.length()-4)+"_postagg.txt";

 //document to POS tagging
 String content = getFileContent(contentFilePath);

 Properties props = new Properties();

 props.setProperty("annotators","tokenize, ssplit, pos");
 StanfordCoreNLP pipeline = new StanfordCoreNLP(props);
 // Annotate the document.
 Annotation doc = new Annotation(content);
 pipeline.annotate(doc);


 // Annotate the document.
 List<CoreMap> sentences = doc.get(CoreAnnotations.SentencesAnnotation.class);
 for (CoreMap sentence : sentences) 
 for (CoreLabel token: sentence.get(CoreAnnotations.TokensAnnotation.class)) 
 String word = token.get(CoreAnnotations.TextAnnotation.class);
 // this is the POS tag of the token
 String pos = token.get(CoreAnnotations.PartOfSpeechAnnotation.class);
 System.out.println(word + "/" + pos);
 }

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