[_]{TEXT}[/_]
if you want.BBCodes and tags are normalized to uppercase by default, so if you use the default tag name for the Emoticons plugin you can't create
[e]
anymore than you can create [E]
.Also, I forgot to mention it but tag names can use a prefix like an XML namespace prefix. So if you want to be able to create BBCodes of any names, you can use prefixed tag names for other plugins, e.g.
foo:bar
for Censor and e:e
for Emoticons, and keep unprefixed tag names for BBCodes. Prefixed tag names are not normalized to uppercase, they're case-sensitive.