Manual:$wgInvalidUsernameCharacters

Users: $wgInvalidUsernameCharacters
Characters to prevent during new account creations.
Introduced in version:	1.15.0 (r48765)
Removed in version:	still in use
Allowed values:	String
Default value:	'@'

Other settings: Alphabetical | By Function

Details

Characters to prevent during new account creations.

This is used in a regular expression character class during registration (regex metacharacters like / are escaped).

Example

In case user names containing @, # and € should be prevented, the following setting is used:

$wgInvalidUsernameCharacters = '@#€';