remove pattern regex last digit in a 7-digit string

First time, long time :P

So with filename:
some.arbitrary.text.ddddddd.ext
where d=digits

In every case, I want to match the 7th/last digit (7 in my example :P) and then remove it. Any way to do that?

Any help much appreciated.

Reply to #1:
Try to use the Remove method:

Remove count: 1
Starting at: 1
Backwards
Apply to: Name

Reply to #2:
50% of my files don't have the string at the end. That forced me to manually select the all the files that did, but that's what I ended up doing late last night.

Reply to #3:
For future use this Regex in Replace.
REPLACE: (.*.)([0-9])
REPLACE WITH: $1
Will delete the last digit no matter the position.