On Thu, Aug 29, 2019 at 09:42:46PM -0400, Eliot Moss wrote: > On 8/29/2019 3:08 PM, Andrey Repin wrote: > > Greetings, ak...@free.fr! > > > > > Hi, > > > I encounter some problem with grep option -E on cygwin 3.0.7 > > > > > > > echo "a^b" | grep "a^b" #answer a^b ie it's OK > > > but > > > echo "a^b" | grep -E "a^b" #answer nothing " for me it's KO > > > > That's an expected result of an impossible constraint. > > > > > I have to backslash ^ to be OK like : grep -E 'a\^b' > > > > Yes. > > > > > Is-it a bug ? > > > > No. > > > > > I don't know if all versions of cygwin and grep are concerned. > > > > RTFM, this is regexp basics. > > There was a really great answer to this earlier. I tried an > answer, but was wrong. One has to read the "fine print" really > carefully. At first I thought it was a bug, at least in the > documentation, but the meaning of a^b, when ^ is the metacharacter, > is kind of subtle (IMO at least). It's easy to miss that > subtlety and think that if ^ is not at the beginning of an > expression it will be treated as an ordinary character ... > > But my main point is that RTM would be enough; RTFM seemed > to me perhaps a little more rude than necessary. > > Regards - EM > I don't see anything to object to in "Read The Fine Manual" ;)
Cheers ... Duncan. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
