Given the followng HTML, I need to count the number of note\_record[0-9] ids with in the note\_table21 id. How would I do this with jquery? NOTE: the number at the end of the note\_record id will be generated dynamically. I need some kind of regex but I'm too much of a jquery noob to get it right

```
<table id="note_table21" width="100%" cellspacing="1" cellpadding="1">
 <tbody>
    <tr id="note_record259">...</tr>
    <tr id="note_record260">...</tr>
    <tr id="note_record261">...</tr>
 </tbody>
</table>

```