The config will be:
$wgAutoCreateTempUser['genPattern'] = '~$1'; $wgAutoCreateTempUser['matchPattern'] = '~2$1'; $wgAutoCreateTempUser['reservedPattern'] = '~2$1';
Notes:
- We can do this before deployment, as long as we don't set 'enabled' to true
- This means no new accounts can be registered starting with ~2
- The 'matchPattern' means we only have to rename 2 accounts ahead of test wiki deployment
- We may set the match pattern and reserved pattern to ~ ahead of pilot wiki deployment, if we choose to rename all users starting with ~. Being discussed in T345678.