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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;

import edu.stanford.nlp.ling.tokensregex.types.Expression;
import edu.stanford.nlp.ling.tokensregex.types.Expressions;
import edu.stanford.nlp.ling.tokensregex.types.Value;
import edu.stanford.nlp.util.CoreMap;

/**
 * Pattern for matching a CoreMap using a generic expression
 *
 * @author Angel Chang
 */
public class CoreMapExpressionNodePattern extends NodePattern {

  Env env;
  Expression expression;

  public CoreMapExpressionNodePattern() {}

  public CoreMapExpressionNodePattern(Env env, Expression expression) {
    this.env = env;
    this.expression = expression;
  }

  public static CoreMapExpressionNodePattern valueOf(Expression expression) {
    return valueOf(null, expression);
  }

  public static CoreMapExpressionNodePattern valueOf(Env env, Expression expression) {
    CoreMapExpressionNodePattern p = new CoreMapExpressionNodePattern(env, expression);
    return p;
  }

  @Override
  public boolean match(CoreMap token) {
    Value v = expression.evaluate(env, token);
    Boolean matched = Expressions.convertValueToBoolean(v, false);
    return (matched != null)? matched:false;
  }

  public String toString() {
    return expression.toString();
  }

}