private static boolean checkCandidate(final String candidate) {
        if (candidate == null) {
            return false;
        }
        for (Pattern p : FORMULA_SCAN_FALSE_POSITIVE_PATTERNS) {
            if (p.matcher(candidate).matches()) {
                return false;
            }
        }
        return true;
    }
Holds implementations for functions in Formula
main/src/main/java/cgeo/geocaching/utils/formulas/FormulaUtils.java