_ is a valid character in user names, but when searching users on stackoverflow.com/users, it is treated as a wildcard(!), not as a character. For example, when I type
w_of__ in the search box, then not only the user
shadow_of__soul appears in the search results, but also, e.g,
BiscutWoofington. The user
Wooff is not shown, which makes sense since it's only 5 characters long and thus doesn't match the pattern
This leads me to the following questions:
- Is the above behaviour a bug or status-bydesign?
_be treated as a normal character, and
?be used as a wildcard instead?
- What characters other than letters and digits are allowed in user names? So far I found spaces and
. - ' _.
(Some testing indicates that underscores are treated just like letters and digits in comment notifications.)