🚀 go-pugleaf

In article <MONTNARO.92Jul21160321@ausable.crd.ge.com> montnaro@ausable.crd.ge.com (Skip Montanaro) writes:
>I'm trying to use sed to trim off all leading "./" patterns from source
>filenames in make rules. On an IBM RS6000 the following works as I expected:
>
>   echo 'enquire.o: ./././enquire.c' | sed 's?: \(\./\)\{1,\}?: ?'
>
>yielding
>
>   enquire.o: enquire.c

   It looks like you're trying to use some sort of extended regular
expression here to match a consecutive range of regexps (in this case,
starting with the first and going to the end).  I've never seen a version
of sed that implements this (including GNU sed).  The following does what
you wanted, however, and is quite portable:

   echo 'enquire.o: ./././enquire.c' | sed 's?: \(\./\)\1*?: ?'

The reason why this works should be obvious. 

>Have I incorrectly specified the sed command or are one (or more) of the
>vendors' sed implementations incorrect? If so, which one(s)? I'm inclined to
>believe the IBM is correct and the others are bugged.

   I don't know.  IBM may have made such an extension, but I'm not familiar
with it.  But a trivial modification to your example makes it work across
all the platforms you mentioned (I didn't bother quoting them in my reply).