Remove Last Number Group?

[ASUNDER]

I screwed up with a batch process and now I'm in hot water.
It added an index number to the end of every file.

So now I have to remove the last group of numbers, from 1 - 1351. That's too many to do manually. 'The Remove Numbers' rename preset doesn't work for this particular case. This is tricky because there already are numbers that have to be kept. Just the last added cluster needs to be removed. Help.

[Jon]

Regex; old name = (.*)\s(\d*)$, new name = \1.

[ASUNDER]

You saved by bon bon thanks.
I'll make a preset out of it, might come in handy later.
Could you guys add a "Last Used" button on the top of the Advanced Rename tool, pls. It would load the last used settings.

[Jon]

Your wish is our command. Hey presto!

[ASUNDER]

Oh damn. Perfect!