Re: "sed" question

Aharon Robbins wrote:

In article <tv26ck-3qt.ln1@ID-313840.user.individual.net>,
Geoff Clare  <netnews@gclare.org.uk> wrote:

POSIX requires that awk uses extended regular expressions (i.e. the
same as regcomp() with REG_EXTENDED).

 
There is the additional requirement that \ inside [....] can
be used to escape characters,

Yes, awk effectively has an extra "layer" of backslash escaping
before the ERE rules kick in, both inside and outside [....].
I didn't mention this so as not to overload the OP with
information - he seemed more interested in the different flavours
of RE than in nitty gritty details like that.

--
Geoff Clare <netnews@gclare.org.uk>