BBcode: How to espace tags i.e. open bracket "["

[teika]

Edit: As pointed out by Akkara in the next message, replace every open bracket [ with
  [[b][/b]
This one displays a snippet you can copy & paste. It's far better than mine. Thanks!

--- Below is obsolete ---
You can escape an open bracket with:
[color=black][[/color]
i.e. by sandwiching an open bracket with "color=black"

Usage example:
[color=black][[/color]topic=1058924]a topic link[/topic]

It produces:
[topic=1058924]a topic link[/topic] (extra closing tags will be rendered as-is.)

I can't find any other simple way that you can copy & paste. It seems to be a kind of BBcode bug.
_________________
Hack of easy Shift / Ctrl / AltGr etc; save your pinkies, type without drudgery: topic 865313

BTRFS - Biden & TRump, Fools Suck.

[Akkara]

You can use a empty italics or bold tag immediately after the '[', and the parser stops trying to interpret it:

[Naib]

noparse is a valid BBcode, just this forum is out of date
_________________
#define HelloWorld int
#define Int main()
#define Return printf
#define Print return
#include <stdio>
HelloWorld Int {
Return("Hello, world!\n");
Print 0;

[teika]

Hm, "valid" is not exact; there's no "official" BB code, and not few forums do fail to support [noparse]. (Arch and Debian forums don't, either.)

Of coures it'd be great if Gentoo Forum gets improved. :)