GNU bug report logs - #74065
documentation suggestion for caret

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From: Greg Minshall <minshall@HIDDEN>
To: bug-sed@HIDDEN
Subject: documentation suggestion for caret
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in the info node
----
5.3 Overview of basic regular expression syntax
----

in the discussion of caret (^), there is this (totally correct, afaik)
text:
----
     =E2=80=98^=E2=80=99 acts as a special character only at the beginning =
of the
     regular expression or subexpression (that is, after =E2=80=98\(=E2=80=
=99 or =E2=80=98\|=E2=80=99).
     Portable scripts should avoid =E2=80=98^=E2=80=99 at the beginning of a
     subexpression, though, as POSIX allows implementations that treat
     =E2=80=98^=E2=80=99 as an ordinary character in that context.
----

on the other hand, POSIX *EREs* allow caret in a subexpression.  this
isn't mentioned in the info node about EREs (which, as that node treats
GNU sed EREs, probably needn't be).  would it be worth mentioning it
here?
----
     =E2=80=98^=E2=80=99 acts as a special character only at the beginning =
of the
     regular expression or subexpression (that is, after =E2=80=98\(=E2=80=
=99 or =E2=80=98\|=E2=80=99).
     Portable scripts should avoid =E2=80=98^=E2=80=99 at the beginning of a
     subexpression, though, as POSIX allows implementations that treat
     =E2=80=98^=E2=80=99 as an ordinary character in that context.  (Note t=
hat POSIX
     *extended* regular expressions, as well as those of GNU sed, do
     allow '^' at the beginning of a subexpression.)
----

cheers.