public boolean matches(String regex) {
        return Pattern.matches(regex, this);
    }

public static boolean matches(String regex, CharSequence input) {
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(input);
        return m.matches();
    }

public static Pattern compile(String regex) {
        return new Pattern(regex, 0);
    }

public Matcher matcher(CharSequence input) {
	if (!compiled) {
	    synchronized(this) {
		if (!compiled)
		    compile();
	    }
	}
        Matcher m = new Matcher(this, input);
        return m;
    }

public boolean matches() {
        return match(from, ENDANCHOR);
    }

 boolean match(int from, int anchor) {
        this.hitEnd = false;
        this.requireEnd = false;
        from        = from < 0 ? 0 : from;
        this.first  = from;
        this.oldLast = oldLast < 0 ? from : oldLast;
        for (int i = 0; i < groups.length; i++)
            groups[i] = -1;
        acceptMode = anchor;
        boolean result = parentPattern.matchRoot.match(this, from, text);
        if (!result)
            this.first = -1;
        this.oldLast = this.last;
        return result;
    }

 boolean match(Matcher matcher, int i, CharSequence seq) {
            matcher.last = i;
            matcher.groups[0] = matcher.first;
            matcher.groups[1] = matcher.last;
            return true;
        }