Hello!

I'm trying to drop rows based on their position related to another row specified in a compound 'if' statement. For example, if I have the following data:
PHP Code:
     | stringvar   flagvar |
     |---------------------|
  1. |     aaaa          . |
  2. |     bbbb          . |
  3. |     ****          . |
  4. |     cccc          . |
  5. |     dddd          . |
  6. |     ****          1 |
  7. |     eeee          . |
  8. |     ffff          . | 
I'm trying to write a code that'll allow me to delete the three rows above the row with a value of 1 in flagvar (observation 6 here) and with the additional specification that a value of "****" should be in stringvar three rows above the row flagged with a 1 in flagvar. So something like
PHP Code:
drop in _n-1 _n-2 _n-3 if flagvar==1 & stringvar[_n-3]=="****" 
Obviously, that code doesn't work, but it's just to illustrate what I'm trying to do. In other words, I want to be able to drop the rows above a row flagged with a value of 1 in flagvar up to and including the next "****" in stringvar in descending order. If run properly, my data would then look like this:
PHP Code:
     | stringvar   flagvar |
     |---------------------|
  1. |     aaaa          . |
  2. |     bbbb          . |
  3. |     ****          1 |
  4. |     eeee          . |
  5. |     ffff          . | 
Is there a way to do this in Stata? I do not want to make reference to specific observation numbers at all in my code because I'm writing a program that could be applied to other similar datasets.

Thanks!