Im looking for a similar command.
This one only addresses number of characters from the start.
How to address say characters from 4 to 8 and replace with x ?
Anyone can help with this?
@addict I agree. Counting the characters is faster than figuring out regexp 
Btw I found this code from here Rename Toolbar v3 (english and french) but is addresses only single character to replace.
[code]<?xml version="1.0" encoding="UTF-8"?>
<rename_preset autorename="yes" case="none" script="yes" type="normal" typeval="0">
</rename_preset>[/code]