I have a problem with some players with strange names.
The main's name is Jûz.
The alt's name are Torosan and Juzan.

Here is the log when i update the main/alts.

[ Jûz ] memberslist - No main match - Main - No alts
[ Torosan ] memberslist - Main: J - Alt of J - Invalid main - Mainless alt
[ Juzan ] memberslist - Main: J - Alt of J - Invalid main - Mainless alt

It show problems with other kind of tildes.
Here is other example.
The main's name is Kellthás.
The alt's name is Dürza.

[ Kellthás ] memberslist - No main match - Main - No alts
[ Dürza ] memberslist - Main: Kellth - Alt of Kellth - Invalid main - Mainless alt

There is unfortunately no standard regex that works in all php versions we support. There are several workarounds, Check http://www.wowroster.net/Forums/viewtopic/t=259.html