I am trying to find a way to index terms like .net but I think adding a . to addexp will cause problems when searching / indexing a term that comes at the end of a sentence.
For example, if I index the following string:
Our database is Texis.
will a search for the word texis show up even though a period is attached to it?
I would think the answer would be no because what gets indexed would be "Texis."
You should keep the normal expression to handle words without . in them. Then add an expression to match those with . as well. You could write the expression to match only leading . (eg: ">>\.=[\alpha]{1,99}") or . anywhere (eg: "[\alpha\.]{2,99}").