Invalid username policy regex

[hubortje]

Steps to reproduce

1. Add regex ^[a-z]+\.[a-z]+$ in the Invalid username policy regex Login name policy field

Expected behaviour

Expression is accepted and users are only allowed to use a name.surname format as a username

Actual behaviour

Get Invalid username policy regex error message.

Server configuration

Operating system:
OMV
Database:
mysql
PHP version:
8.2.9
Nextcloud version: (see Nextcloud admin page)
27.0.2
Where did you install Nextcloud from:
Docker

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^\p{Ll}+\.\p{Ll}+$ is invalid because it features non-legal letters, yet ^[a-z]+\.[a-z]+$ only features lowercase and a-z and a period?

[tcitworld]

Hi,
Regex need to have / at the beginning and the end of the value.
/^[a-z]+\.[a-z]+$/ works as intended.