I was bored, so..

It's a regular expression, Regexes are a very very powerful pattern matching system used frequently in various forms in software development on both windows and *nix, or in general administration on *nix.

bb = to be (Letter Bx 2)
| = or
[^b] = not b
{2} = two of the previous

2 b or not 2 b
 
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