How to use

join

method

in

com.orgzly.org.OrgStringUtils

  public String toString() {
    return OrgStringUtils.join(this, DELIMITER);
  }
}

/**
 * Given a sets of to do and done keywords, builds a regex for matching against heading.
 *
 * @return {@link Pattern} or null if no valid keywords were found.
 */
private Pattern buildStatePattern(Set<String> todoKeywords, Set<String> doneKeywords) {
  Set<String> allKeywords = new HashSet<>();
  if (todoKeywords != null) {
    for (String keyword: todoKeywords) {
      allKeywords.add(Pattern.quote(keyword));
    }
  }
  if (doneKeywords != null) {
    for (String keyword: doneKeywords) {
      allKeywords.add(Pattern.quote(keyword));
    }
  }
  if (allKeywords.size() > 0) {
    return Pattern.compile("^(" + OrgStringUtils.join(allKeywords, "|") + ")(.*)");
  }
  return null;
}