What version do you have? I find when I test the latest vb3 version (3.8.7PL2) that although the registration page allows me to enter a username with multiple consecutive spaces, they are removed (condensed to one space) when the user is created. But a while back there was an issue where usernames could be duplicated by including some sort of non-printable characters, and there was a regular expression that was given as a work-around. I don't know if 3.8.7PL2 fixes that in some other way or not.
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