anchor.diff:  Regex syntax
   ~~~~~~~~~~~~
   
  -The regex syntax supported by Kakoune is the Perl syntax currently provided 
  +The regex syntax supported by Kakoune is the Perl syntax currently provided
   by Boost :
   http://www.boost.org/doc/libs/release/libs/regex/doc/html/boost_regex/syntax/perl_syntax.html[Perl Regular Expression Syntax].
   
  
positive.code:  * `debug` _flags(hooks|shell|profile)_: dump various debug information in
     the `*debug*` buffer.
   * `idle_timeout` _int_: timeout, in milliseconds, with no user input that will
     trigger the `PromptIdle`, `InsertIdle` and `NormalIdle` hooks. 
   * `fs_checkout_timeout` _int_: timeout, in milliseconds, between checks in
     normal mode of modifications of the file associated with the current buffer
     on the filesystem.
  
negative.code:  * `kak_selections`: content of the selection separated by colons, colons and backslashes in
          the selection contents are escaped with a backslash.
   * `kak_selection_desc`: range of the main selection, represented as `anchor,cursor`;
          anchor and cursor are in this format: `line.column`
   * `kak_selections_desc`: range of the selecations separated by colons
   * `kak_bufname`: name of the current buffer
   * `kak_buffile`: full path of the file or same as `kak_bufname` when
  