Re: RFE: upgrade 'sed' RE's to include perlre syntax.

    > Both simple atoms such as "\d" for [0-9] or "\S" for non-space characters
    > are supported in awk and have been added to grep with the -P switch.
    > 
    > Would it be possible to add a -P type switch to 'sed' so that
    > pcre compat RE's could be used?
    
    Yes, indeed part of the work is already done and part of the GNU sed
    tarball (search for REG_PERL).  Though the option was -R, not -P.
    
I want to release a new version of sed this August (it is time!) and I
would love to include this functionality on it.  I think it is not too
late to use -P instead of -R, to keep some uniformity with the other
tools.