I've seen in some novel that, in the table of contents, the page number is before the chapter title, for example:

3    Down the Rabbit Hole
7    The Pool of Tears
15   The Caucus Race and a Long Tale


How can I obtain the same using memoir class?

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This post: Formatting the title of the TOC is not related to memoir, but it might be a good starting point. –  mvarela May 13 '12 at 6:26
@mvarela: Welcome to TeX.sx! I converted your answer to a comment because links to other answers do not qualify as answers themselves. Unfortunately you can't post comments to other peoples questions as long you don't have 50rep. –  Martin Scharrer May 13 '12 at 7:48

You can achieve the desired result in many ways. Below there's one such possibility; I assumed the sectional unit used was \chapter:

\documentclass{memoir}

% redefinition for the ToC title
\renewcommand\printtoctitle[1]{\HUGE\sffamily#1}

% redefinitions for chapter entries
\renewcommand\chapternumberline[1]{}
\renewcommand\cftchapterfont{\sffamily}
\renewcommand\cftchapterpagefont{\huge\sffamily}

\makeatletter
\newcommand\l@mychap[3]{%
\vskip2ex%
\par\noindent
\parbox{2.5em}{%
\hfill{\cftchapterpagefont#2}%
}\hspace*{3em}%
\parbox{\dimexpr\textwidth-5.5em-15pt\relax}{%
\cftchapterfont#1%
}\par%
}

\renewcommand*\l@chapter[2]{%
\l@mychap{#1}{#2}{\chaptername}%
}
\makeatother

\begin{document}

\tableofcontents*

\chapter{Down the Rabbit Hole}
\chapter{The Pool of Tears}
\chapter{The Caucus Race and a Long Tale}
\setcounter{page}{14}% just for the example

\end{document}


The code above will align the page numbers to the right; to get them aligned to the left, \l@mychap must be defined using something like

\newcommand\l@mychap[3]{%
\vskip2ex%
\par\noindent
\parbox{4.5em}{%
{\cftchapterpagefont#2}\hfill%
}%
\parbox{\dimexpr\textwidth-4.5em-15pt\relax}{%
\cftchapterfont#1%
}\par%
}


Using this redefinition (in the full example code above) instead of the initial one, one obtains

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