When I'm feeling lazy in the ChatterBox, I use "[[]" for "[". For example, "[[]test]" gives "[test]". "]" doesn't need escaping, with or without this trick.

Update: Oops, this should have been a reply to the OP.

In reply to Re^2: How to escape square bracket in PM? by ikegami
in thread How to escape square bracket in PM? by johnnywang

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