I would be very tempted to use the HTML or XML DOM to access the information. Depending on how you want to extract the text or what else is in the original source text, you could find all <table> tags, then within that find all <td> tags and look for the 'innerText' value.
If you really need a regex solution, you could try
<[^>]*>|\s+|([^<]*)
which will find all text that is not inside a tag. You will actually get a lot of matches but if you look at match group #1, any non-null value will be the text you are after. If you need to limit the search to obnly be within the <table> tags, then use
<table[^>]*>(<[^>]*>|\s+|([^<]*))+</table>
and look at match group #2. Again, depending on the actual structure of the source text, you may need to ignore any null text matches in this group, but there should only be a few.
Susan