If you type it manually then @\_Testfoo_ works. Maybe the @ username auto-completer could slip the backslash in.
@\_Testfoo_
People would probably freak out and remove it.
Though I could run the mentions regexp over the raw markdown and see if it makes sense to perform the escaping at that point.
@Nick.Earthloop started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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If you type it manually then
@\_Testfoo_
works. Maybe the @ username auto-completer could slip the backslash in.