This plugin tries to duplicate the functionality of Marc Weber's 
outline.vim (vimscript #1947) on the basis of its description and of 
vim's own |:g|. Other than outline.vim, it relies on tlib (vimscript 
#1863).

The TToC command can be used to get a quick table of contents of the 
buffer based on a given regular expression. The regexp can be defined on 
the command line, in window (w:ttoc_rx), buffer-local (b:ttoc_rx) 
variables or in global filetype-specific (g:ttoc_rx_{&filetype}) 
variables. The order actually is: [wbg]:ttoc_rx_{&filetype} > 
[wbg]:ttoc_rx.

The TToC command can also evaluate an expression to get the line 
numbers. The expression is evalutated if TToC is invoked without a regex 
argument and the expression is defined for that filetype 
([wbg]:ttoc_expr_{&filetype}). The expression needs to return either a 
sorted and unique list of line numbers either as a vim list or as a 
newline-separated string.

In the list view, you can select a line and either preview it (<c-p>), 
jump there (<), close the list and jump there (<cr>).

Example: >

  " Use the default settings for the current file-type
  :TToC
  " Show all words beginning at column 1
  :TToC ^\w
  " Show 'if' statements (but not the concluding 'then' statement)
  :TToC ^\s*if\>.\{-}\ze\s\+then
  " Show 'if' statements and 3 extra lines
  :3TToC! \<if\>

The TToC with a bang works somewhat like |:g| only that you can 
browse/filter the list and select an item after reviewing the results. 
Try it out and compare (with the help file as current buffer): >

  :TToC! TToC

with >

  :g/TToC



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Status:  Works for me (there may be some minor quirks)
Dependencies:
  tlib :: http://github.com/tomtom/tlib_vim
      > git clone git://github.com/tomtom/tlib_vim.git
Install: See http://github.com/tomtom/vimtlib/blob/master/INSTALL.TXT
See http://github.com/tomtom for related plugins.