Java By Comparison

Document Using Examples

class Supply {

    /**
     * The code universally identifies a supply.
     *
     * It follows a strict format, beginning with an S (for supply), followed
     * by a five digit inventory number. Next comes a backslash that
     * separates the country code from the preceding inventory number. This
     * country code must be exactly two capital letters standing for one of
     * the participating nations (US, EU, RU, CN). After that follows a dot
     * and the actual name of the supply in lowercase letters.
     */
    static final Pattern CODE =
            Pattern.compile("^S\\d{5}\\\\(US|EU|RU|CN)\\.[a-z]+$");
}

Some programming constructs are very powerful, but also very complex. Regular expressions fall into this category. ...