fix: added cyrillic symbols in regexp (#1980)

[Pihail]

Description

Fix #1980

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[pietrygamat]

As far as I understand, this only adds Cyryllic to basic alphanumeric characters. That still leaves quite a number of characters in other scripts as well as diacritics in Latin, that should be accepted based on the same principle. On top of that I'd argue the \s excludes a few problematic variants of whitespace that should in fact be escaped.

My proposition is the following:
/[^\p{L}\p{N} \.-_]/gu
That is:

• /gu for full unicode
• \p{L} - any kind of letter from any script
• \p{N} - any kind of numeric character in any script
• \.-_ - a literal whitespace, a dot, a dash and an underscore

Would bruno support that?