code: function checkRegex(node, schema, key) {
      try {
        schema[SCHEMAREGEX].test(node);
      } catch (e) {
        throw new ValidationException(key + " doesn't match its regex.");
      }
    }
docs: Check regex.
  @param  {[type]} node   [description]
  @param  {[type]} schema [description]
  @param  {[type]} key    [description]
  @return {[type]}        [description]