Non-alphanumerics in posters' names

[streaky]

Posters' names containing certain non-alphanumeric characters cause problems with the quoting system, as illustrated below:

Fred _ Bill said:

The underscore character is OK

[quote=Fred ?]But a question mark character isn't

Fred * said:

An asterisk character works OK

[quote=Fred &]But an ampersand doesn't

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And the actual effects are somewhat undefined. See this example, where the username containing an ampersand is placed first in the list of quotes:

[quote=Fred &]An ampersand screws it up

Fred _ Bill said:

The underscore character is OK

[quote=Fred ?]But a question mark character isn't

Fred * said:

An asterisk character works OK

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Can either the quoting problem be fixed, or the posters' naming rules prevent the use of unacceptable non-alphanumerics?

Many thx - Streaky