Why Isn't My Regex Replacement Clearing the Entire Google Doc in n8n?

I'm trying to clear all content from a Google Doc using n8n. Credentials are connected, the DocID is correct, and I can successfully add text. However, the only available actions are Insert and Find and Replace, and my regex attempts aren't clearing the document.

I tried the following regex expressions:

REGEXCopied
replace Text to Find: [\s\S]*

and

REGEXCopied
.*

Neither of these approaches completely clears the document. I'm using last version (1.74.3) at app.n8n.cloud.

Any guidance on how to remove all existing text from the document would be appreciated.