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Vimscript: regex works in :s but not in substitute()
:redir => x|silent :ls|redir END
:let y = substitute(x, ".*(".*").*", "1", "g")

let buflist=map(filter(range(1, bufnr('$')), 'buflisted(v:val)'), 'bufname(v:val)')

function BufName(bnr)
    let bn=bufname(a:bnr)
    let bt=getbufvar(a:bnr, '&buftype')
    if empty(bn)
        return (empty(bt)?('[No Name]'):('[Scratch]'))
    elseif empty(bt)
        " This won't produce names like ../file, while :ls will "
        return fnamemodify(bn, ':~:.')
    elseif bt is# 'help'
        return fnamemodify(bn, ':t')
    else
        return bn
    endif
endfunction

let bufliststr=join(buflist, "n")

1 #    "~/Session.vim"                line 5
2      "~/.vimrc"                     line 34
3      ".vim/vscripts/makesess.vim"   line 4
4      "~/Documents/vimcht"           line 62
5      "~/.fluxbox/startup"           line 5
6      "~/Documents/Notes"            line 2604
7      "~/Documents/bashcht"          line 21
8 %a   "junk"                         line 10

:let y = ""
:let y = substitute(x, '[.]*("[.]*")[.]*', '1', "g")

"junk"

:let y = ""
:let y = substitute(x, '[^n]*("[^n]*")[^n]*', '1', "g")

:let y = substitute(x, '[^"]*("[^"]+")[^"]*', ':tabe 1n', 'g')

:tabe "~/Session.vim"
:tabe "~/.vimrc"
:tabe ".vim/vscripts/makesess.vim"
:tabe "~/Documents/vimcht"
:tabe "~/.fluxbox/startup"
:tabe "~/Documents/Notes"
:tabe "~/Documents/bashcht"
:tabe "junk"