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| Reply-To: | Brian DOT Inglis AT SystematicSw DOT ab DOT ca |
| 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> <806ab587-a07c-1616-1486-ebb258ace1d9 AT cs DOT umass DOT edu> |
| From: | Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca> |
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| Message-ID: | <0ca60f0b-4765-b870-7eef-85d9944e0406@SystematicSw.ab.ca> |
| Date: | Fri, 30 Aug 2019 00:12:50 -0600 |
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On 2019-08-29 19:42, Eliot Moss wrote: > On 8/29/2019 3:08 PM, Andrey Repin wrote: >>> 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. https://cygwin.com/acronyms/#RTFM exists and has been amusing rather than rude in our industry for decades, especially in non-native English locales e.g. here in this list: "Read The Fine Manual"; but RTM for software products is usually "Release To Manufacturing", from the days when media was produced! -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised. -- 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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