Regular expression for format commonly used in Japanese phone number

gistfile1.java

public static final String SPACE = "[\\s\u3000]";
public static final String NUMBER = "[0-9\uff10-\uff19]"; // 0-9０-９
public static final String HYPHEN = "[-\uff0d\u2212]";
public static final String NOT_NUMBER_OR_HYPHEN = "[^" + NUMBER.substring(1, NUMBER.length()-1) + HYPHEN.substring(1);

public static final String SEPARATOR = "[\\(\\)" + HYPHEN.substring(1, HYPHEN.length()-1) + "]";
public static final String REGEX_PHONEFAX =
    "(?:" + NOT_NUMBER_OR_HYPHEN + "|^)" +
    SPACE + "*(" + NUMBER + "{2,4})" + 
    SPACE + "*" + SEPARATOR + 
    SPACE + "*(" + NUMBER + "{2,4})" +
    SPACE + "*[" + SEPARATOR.substring(3) +
    SPACE + "*(" + NUMBER + "{2,4})(?:" +
    NOT_NUMBER_OR_HYPHEN + "|$)";
public static final Pattern PATTERN_PHONEFAX = Pattern.compile(REGEX_PHONEFAX);