How can I create a UDL that autoCompletes closing tags (like for XML/HTML)

[mccrispy]

I’m working on an offline editor for a site that uses a MediaWiki-like markup. I want to close tags like when I create an HTML <b>my text </b>, the markup the site uses would be [b]my text[/b].

Can I create an auto-closing UDL (i.e. one that puts the [/b] when I type/autoComplete [b]?