According to What symbols/characters are not allowed in tags?, the list of allowed tag characters are [a-z 0-9 + # - .]
Currently, it seems that tags ending in -
don't work properly on Stack Exchange. So for example, if I had a question about C--, I wouldn't be able to ask it on Stack Overflow
Allowed
Not Allowed
Is this naming limitation by design? If tag names can include +
, is there a reason they can't end with -
?
*Thanks to Rene for their SE Data Explorer query searching tags ending in +
or -
Edit: After experimenting with the SE Data Explorer, I've found that there are a few other hidden restrictions on tag names. (See What symbols/characters are not allowed in tags?)
+
can only be used at the end of a tag, while-
can only be used in the middle.