User ID
The name of the user, following these rules:
- 1-8 characters
- All characters alphanumeric or > + & ! $ - / | _ < ? ` : # @ % ' " ~ { } [ ] \ * ( ) , . =
- The characters %, ?, * are used as wildcards.
- % and ? are single character position wild cards.
- * is a multi-position wildcard and it must be the last character.