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Not a bug Invalid regular expression

Affected version
2.0.0 RC2
#1
I can not use following regexp for user registration. No idea why as it is a valid one.

Code:
^[a-zA-Z0-9]+$
Getting following error on save
Oops! We ran into some problems.
Invalid regular expression
EDIT: We have all tables converted to utf8mb4 and the config parameter is present. If that makes any difference.
 
Last edited: