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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.ling.tokensregex.matcher;

/**
* Exact match cost function
*
* @author Angel Chang
*/
public final class ExactMatchCost extends MatchCostFunction.AbstractMatchCostFunction {
  final double mismatchCost;
  final double insCost;
  final double delCost;

  public ExactMatchCost() {
    this(1);
  }

  public ExactMatchCost(double mismatchCost) {
    this(mismatchCost,1,1);
  }

  public ExactMatchCost(double mismatchCost, double insCost, double delCost) {
    this.mismatchCost = mismatchCost;
    this.insCost = insCost;
    this.delCost = delCost;
  }

  @Override
  public double cost(K k1, K k2, int n) {
    if (k1 != null) {
      if (k2 == null) return delCost;
      return (k1.equals(k2))? 0:mismatchCost;
    } else {
      return (k2 == null)? 0:insCost;
    }
  }

}