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Subject: | Re: bug with grep 3.0.2 in cygwin 3.0.7 |
To: | cygwin AT cygwin DOT com |
References: | <1910922536 DOT 1217465852 DOT 1566975322390 DOT JavaMail DOT root AT zimbra76-e14 DOT priv DOT proxad DOT net> <1207614124 DOT 1217647925 DOT 1566976580120 DOT JavaMail DOT root AT zimbra76-e14 DOT priv DOT proxad DOT net> <8910174142 DOT 20190829220811 AT yandex DOT ru> |
From: | Eliot Moss <moss AT cs DOT umass DOT edu> |
Message-ID: | <806ab587-a07c-1616-1486-ebb258ace1d9@cs.umass.edu> |
Date: | Thu, 29 Aug 2019 21:42:46 -0400 |
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On 8/29/2019 3:08 PM, Andrey Repin wrote: > Greetings, akiki AT free DOT 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 -- 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
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