How to prevent Rename Dialog popping up?

I have 2 rename presets setup; as far as I can tell, they're called exactly the same, but one is via a toolbar button, 1 by the context menu. The button call does not show the rename dialog, it just does the rename (which is what I want).

The context menu call always brings up the rename dialog window when I click it, requiring a second click on the OK button, instead of just renaming automatically?

Here's a screenshot of both settings, where am I screwing up?

It's because (presumably) the Replace string is a space in one case but empty in the other. If either of the Find or Replace strings is empty then the dialog appears, assuming the preset was incomplete and intended to fill in some details with the rest being typed each time it is run.

Instead of the preset, use this command:

Rename PATTERN=" (1)" TO FINDREP

Aha! That makes sense. Muchos Gracias, Leo.