\r
/**\r
* Regular expression for checking form of query string understood by this\r
- * source.\r
+ * source. If the Regex includes parenthesis, then the first parenthesis\r
+ * should yield the same accession string as the one used to annotate the\r
+ * sequence. This is used to match query strings to returned sequences.\r
* \r
* @return null or a validation regex\r
*/\r