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/usr/share/highlight/langDefs/bbcode.lang is in highlight-common 3.8-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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-- Language definition generated by lang2to3

Description="BBcode"

Keywords={
  { Id=1,
    Regex=[[ \[\/?\w+|\] ]],
    Group=0,
  },
  { Id=2,
    Regex=[[#\p{XDigit}{6}]],
  },
}

IgnoreCase=true