Sorry, my mistake. The sentence is correct in the manual.

Arni



On Wed, 28 Jul 2010, Juanma Barranquero wrote:

> On Wed, Jul 28, 2010 at 01:31, Arni Magnusson <arnima@hafro.is> wrote:
>
>>  Therefore, the read syntax for a regular expression matching
>>  @samp{\} is @code{"\\\\"}.
>>
>> should be
>>
>>  Therefore, the read syntax for a regular expression matching
>>  @samp{\\} is @code{"\\\\"}.
>
> Why do you think so?
>
> The section is talking about the read syntax. To match \, you need a 
> regexp with \\, and to write \\ in a string, you need \\\\.
>
> Try
>
>  emacs -Q
>  \ <left>
>  M-: (looking-at "\\") <RET>   => (invalid-regexp "Trailing backslash")
>  q
>  M-: (looking-at "\\\\") <RET> => t
>
> Note that \\\\ is matching a single \ on the buffer, not \\
>
>     Juanma
>