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My GitHub username is Lord-Evil. But I get this error while going through registration form "The field “GitHub” has invalid characters, only alphanumeric characters are allowed."

Lord_Evil wrote:... only alphanumeric characters are allowed."

I might be wrong but maybe the "minus" sign is normally not considered a letter or counted to the numbers so by definition it is not an "alphanumeric" character ;-)

This is correct, but you are missing the point Lord_Evil wants to make. GitHub allows the dash, so the GidHub field in the forum should allow it, too.

Here is the rule for GitHub user names:

Username may only contain alphanumeric characters or dashes and cannot begin with a dash

(pasted from GitHub)
Under this rule, “Lord-Evil” is a valid GitHub user name.

This means, Lord_Evil made a valid bug report and the forum rule for the GitHub field must be changed.

Fixed, dashes should now be allowed.