complexWordIdentification(text, words) {
    // list of "complex words"
    const complexWords = words;
    // array will be populated with results.
    const results = [];
    // loop through each complex word and see if it occurs in the text
    let match, regexp;

    for (let i = 0; i < complexWords.length; i++) {
      // the complex word we are checking in this iteration
      const complexWord = complexWords[i];
      // the complex word we are checking in this iteration
      regexp = new RegExp(complexWord, 'g');

      while ((match = regexp.exec(text)) !== null) {
        // the results object
        const result = {
          begin: (regexp.lastIndex - complexWords[i].length),
          end: regexp.lastIndex,
          text: complexWord
        };
        // add the object to the results array
        const index = results.length;
        results[index] = result;
        console.log(result);
      }
    }
    // return the results array when done
    return results;
  }