Here is Zippo's solution from an older thread:
Type: Regular Expressions
Old Name: b(([^0-9]).|.([^0-9]))(...)#[/b]
New Name: \1\3 \4\5
Or, if you want to make a button instead of using the Rename dialog:
@NoDeselect
Rename REGEXP PATTERN="(.*)(([^0-9])\.|\.([^0-9]))(.*\..*)#" TO="\1\3 \4\5"
I'll add this to the Various simple rename presets thread, too.
(The regular expression isn't simple but the idea for what it does is.)