How do I extract a substring when I know what become before and after it

I am able to get the HTML source of a web page and I want to get certain information from it.
I am trying to extract a 1 or 2 digit number but sometimes it is not there but I know that this comes exactly before the number if it exists or not
"</td>
<td class="alt1">"
Which translates to regex as "</td>\r\n\t\r\n\t\r\n\t\r\n\t\r\n\t\r\n\t<td class=\"alt1\">" Then the number appears just after the "<td class="alt1">" and I want to automatically say its 0 if its not there.
How easy is it to extract that number?

Normally I would be happy to help you, but after several years of trying to help here, I've decided not to contribute anymore because of the piss-poor way in which this site is being administered.
Others are still helping, but more may leave if things don't improve. May I recommend devshed or javaranch?
http://www.devshed.com/
http://www.javaranch.com/
If you would like to complain to the admins of this forum, either click the "Report Abuse" link or the "Feedback" link.
The forum denizen formerly known as [url http://forum.java.sun.com/profile.jspa?userID=2959]jverd

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Here is the data sample:
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1 00   Z   01/02/1999
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There are many students with many periods and many codes. I need to save a date when code = 'G' and count separateley records per student/period 2 times - before and equal that date and after that date, so in the end for period 00 I will have 2 values: 3 (before) and 1(after).
There are periods from 00 to 08. I am counting students abscencies before and after warning letter was sent (code G).
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Please help me.
Thank you.
Ann2

Post Author: Ann2
CA Forum: Formula
Thank you for your answer, but I do care about the date the 'G' happened, because I need to reset count.
The logic behind is this:if a student absent for more than 8 times per period - the letter will be sent out to the parents , that will be code 'G' with period '-1' (it may happen that there will never be code 'G' , but I need to track all absencies). Once the letter is sent, the count starts over (the count starts over the next day after code 'G'). The absencies which happened before or the date the letter sent should count toward 'previous' abscenices, all other - absenices after the letter.
So basically I need total per period and total per period before or the day with code 'G'. Running total with reset with formula code = 'G' does not work.
I created a formula field which has global date (when code 'G' happenned) and it says if globaldate >= periodDate then date (1900,01,01) else (2100,01,01) and that formula is ok, but I can not use it in running total or can not create group on it and insert total.
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How do I extract a substring when I know what become before and after it

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