Steps to reproduce:

1. Open Python console
2. Execute: regexp = r"[a-z]\d+[A-Z]"
3. Input: regexp = r"\b\d{3}\w+\b" but do not press Enter to execute
4. Press the up arrow once
5. Press the down arrow once

Actual behavior:

Performing step (4): NVDA reports: regexp = r"[a-z]\d+[A-Z]"
Performing step (5): NVDA reports: "blank"

Expected behavior:

Performing step (5), NVDA reports: regexp = r"\b\d{3}\w+\b"

NVDA logs, crash dumps and other attachments:

System configuration

NVDA installed/portable/running from source:

Installed, portable

NVDA version:

2024.1

Windows version:

Windows 10 22H2 (AMD64) build 19045.4412

Name and version of other software in use when reproducing the issue:

None

Other information about your system:

None

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

This is a behavior change introduced in 2024.1 by #15794,

If NVDA add-ons are disabled, is your problem still occurring?

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes