code: @NonNull
      public String getCurrentKeywordsString() {
          String keywordsString = getCurrentTokenString();
          if (keywordsString.length() > 0 && mTokenizer.isExplicitChar(keywordsString.charAt(0))) {
              keywordsString = keywordsString.substring(1);
          }
          return keywordsString;
      }
docs: Gets the keywords that the {@link Tokenizer} is currently considering for mention suggestions. Note that this is
  the keywords string and will not include any explicit character, if present.
  
  @return a String representing current keywords in the {@link EditText}