vim regex

gistfile1.txt

  " Parse current buffer :syntax for hl names that link to hl-groups
  function! activewin#syntax#Parse()
    redir => l:buf_syntax
      silent exec 'syntax'
    redir END

    let l:group_keys = []
    let l:hl_pattern = '^\w\+\(\_.*links to\)\@='
    call substitute(l:buf_syntax, l:hl_pattern, '\=add(l:group_keys, submatch(0))', 'g')
    echom string(l:group_keys)
  endfunction