"Marcello Cruz" <marcello.c...@globo.com> wrote:
> Dear friends,
>
> I've read the documentation about sed - sed(8), re_format(7) and
> /usr/share/doc/usd/15.sed/ - but I still don't realize how to make this
> command work:
>
> $ s/(^[A_Z]{1})([a-z]+)\.sgml/\1\2\.html/g
>
> As I read I must prefix the '{', '}', '(' and ')' with backslashes. Even if
> I do so, the command does not work. The command should take a filename
> starting with a capital letter followed with the extension 'sgml' and
> translate the extension to 'html'.
>
> Accordingly to http://www.bsd.org/regexintro.html it should work, but it
> does not.
>
> I think there is some bug with the implementation of sed or the "branch"
> (one or more pieces concatenated - as stated under re_format) is not
> supported with BRE.
>
> Someone could clarify this to me, please? Also, how do I get the expected
> result?
>
> Rgds
> Marcello
You didn't read re_format(7) well:
Basic regular expressions differ in several respects:
o `|', `+', and `?' are ordinary characters and there is no equiva-
lent for their functionality.
o The delimiters for bounds are `\{' and `\}', with `{' and `}' by
themselves ordinary characters.
$ sed -e 's/\(^[A_Z]\{1\}\)\([a-z]\{1,\}\)\.sgml/\1\2\.html/g'
Saludos.
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