The find is doing what you told it to find.

You told it to find all text between A and B.

A


exampletext exampletext exampletext exampletext exampletext exampletext

A
exampletext exampletext exampletext exampletext exampletext exampletext
B

meets this definition

So does:
A
exampletext exampletext exampletext exampletext exampletext exampletext
B

I know of no way to exclude text between A and A without an intervening B.