options

/*
 *  call-seq:
 *     rxp.options   => fixnum
 *  
 *  Returns the set of bits corresponding to the options used when creating this
 *  Regexp (see <code>Regexp::new</code> for details. Note that additional bits
 *  may be set in the returned options: these are used internally by the regular
 *  expression code. These extra bits are ignored if the options are passed to
 *  <code>Regexp::new</code>.
 *     
 *     Regexp::IGNORECASE                  #=> 1
 *     Regexp::EXTENDED                    #=> 2
 *     Regexp::MULTILINE                   #=> 4
 *     
 *     /cat/.options                       #=> 128
 *     /cat/ix.options                     #=> 131
 *     Regexp.new('cat', true).options     #=> 129
 *     Regexp.new('cat', 0, 's').options   #=> 384
 *     
 *     r = /cat/ix
 *     Regexp.new(r.source, r.options)     #=> /cat/ix
 */

static VALUE
rb_reg_options_m(re)
    VALUE re;
{
    int options = rb_reg_options(re);
    return INT2NUM(options);
}