Re: [Bug-ed] Searching for multiple matches with \+ isn't working

[Brian Zwahr]

Ah ha. Thanks! I see the mention in the BSD `info ed`. I assume you're right. 
Perhaps the Homebrew formula can be changed to build against a regex 
implementation that includes support for \+, etc. 

Either way, though, shouldn't the GNU ed manual (I linked it in a previous 
message) mention needing extensions or a specific regular expressions 
implementation in order for all operators, like \+, to work? The BSD ed man 
page mentions it, as you've pointed out. The GNU ed documentation should also 
mention it.

On Wed, Jan 2, 2019, at 4:23 PM, John Cowan wrote:
> Oops, sorry, I was looking at info ed, which is the BSD ed.  Info ged says 
> they are supported.  So it looks like it's a brew problem: ed is being built 
> against a pure Posix regular expression package, probably a BSD one.
> 
> On Wed, Jan 2, 2019 at 5:21 PM John Cowan <address@hidden> wrote:
>> Info ed is the source of the statement that what regex things work depends 
>> on the regex package ed was built with.  Jump down to COMMANDS and it's 
>> right above that, the last paragraph in the REGULAR EXPRESSIONS section.
>> 
>> The link to the Posix standard is the source of the statement that \+ etc. 
>> are not defined in Posix basic REs.
>> 
>> On Wed, Jan 2, 2019 at 4:40 PM Brian Zwahr <address@hidden> wrote:
>>> Thanks for the response. I didn't realize any of that. The GNU ed manual 
>>> makes no mention of that on the Regular Expressions page. It just lists \+ 
>>> as valid. Does the manual need to be updated to include this information? 
>>> Additionally, I've checked `info ed` and I don't see anything about 
>>> extensions or only having access to things like \+ conditionally based upon 
>>> how ed was compiled or installed. Am I just not seeing it in the info? 
>>> Which page is it on?
>>>  
>>>  https://www.gnu.org/software/ed/manual/ed_manual.html#Regular-expressions
>>>  
>>>  
>>>  On Wed, Jan 2, 2019, at 3:07 PM, John Cowan wrote:
>>>  > ed uses Posix basic REs, and the use of \+ in basic REs to get the 
>>> effect of + in extended REs is a non-Posix extension.  See 
>>> <http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_05_01>,
>>>  where there is no mention of \+ except its use in extended REs.  The same 
>>> is true of escaped ?, (, ), |, {.
>>>  > 
>>>  > The `info ed` command documents that exactly which regular expression 
>>> characters work depends on the regex package with which ed was built.
>>>  > 
>>>  > -- 
>>>  > John Cowan          http://vrici.lojban.org/~cowan        address@hidden
>>>  > He made the Legislature meet at one-horse tank-towns out in the alfalfa
>>>  > belt, so that hardly nobody could get there and most of the leaders
>>>  > would stay home and let him go to work and do things as he pleased.
>>>  >     --H.L. Mencken's translation of the Declaration of Independence
>>>  > 
>>>  > 
>>>  > On Wed, Jan 2, 2019 at 3:52 PM Brian Zwahr <address@hidden> wrote:
>>>  >> I'm having an issue where using \+ to search for multiple matches isn't 
>>> working. Am I doing something wrong?
>>>  >>  
>>>  >>  I have GNU ed 1.14.2 installed on the latest macOS through Homebrew 
>>> (https://brew.sh). Homebrew installed the executable as ged instead of ed, 
>>> to not overtake the BSD ed that ships with macOS. I mention this so you 
>>> understand why the command I'm running is ged instead of ed.
>>>  >>  
>>>  >>  I see that 1.15 is in pre-release, but I don't see this issue 
>>> addressed in the changelogs I'm seeing in the archives of this list.
>>>  >>  
>>>  >>  Here are steps to reproduce:
>>>  >>  
>>>  >>  $ ged -v
>>>  >>  # Let's add a couple of lines.
>>>  >>  a
>>>  >>  foobar
>>>  >>  bazfoo
>>>  >>  .
>>>  >>  # Great! Now, let's search for "o".
>>>  >>  g/o/
>>>  >>  foobar
>>>  >>  bazfoo
>>>  >>  # Both lines match. Perfect. Now, let's search for multiple "o"s.
>>>  >>  g/o\+/
>>>  >>  # Not found? :-(
>>>  >>  q
>>>  >>  ?
>>>  >>  Warning: buffer modified
>>>  >>  q
>>>  >>  
>>>  >>  Proof of version:
>>>  >>  
>>>  >>  $ ged -V
>>>  >>  GNU ed 1.14.2
>>>  >>  Copyright (C) 1994 Andrew L. Moore.
>>>  >>  Copyright (C) 2017 Antonio Diaz Diaz.
>>>  >>  License GPLv3+: GNU GPL version 3 or later 
>>> <http://gnu.org/licenses/gpl.html>
>>>  >>  This is free software: you are free to change and redistribute it.
>>>  >>  There is NO WARRANTY, to the extent permitted by law.
>>>  >>  
>>>  >>  _______________________________________________
>>>  >>  bug-ed mailing list
>>>  >>  address@hidden
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