grep branch, master, updated. v3.9-5-g373b443

[Paul Eggert]

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http://git.savannah.gnu.org/cgit/grep.git/commit/?id=373b4434ebc15f447ca6f96007ed6181c9a2a496


commit 373b4434ebc15f447ca6f96007ed6181c9a2a496
Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Sun Mar 19 01:45:53 2023 -0700

    doc: distinguish Perl from PCRE
    
    * doc/grep.texi: Mention that PCRE might not match Perl exactly.

diff --git a/doc/grep.texi b/doc/grep.texi
index eaad6e1..b17c4da 100644
--- a/doc/grep.texi
+++ b/doc/grep.texi
@@ -1156,6 +1156,12 @@ we expect to make that the default, so it will be 
overridable.
 @c $ LC_ALL=en_US.UTF-8 ./pcre2grep -u '^\d+' <<< '٠١٢٣٤٥٦٧٨٩'
 @c ٠١٢٣٤٥٦٧٨٩
 
+@item
+Although PCRE tracks the syntax and semantics of Perl's regular
+expressions, the match is not always exact, partly because Perl
+evolves and a Perl installation may predate or postdate the PCRE2
+installation on the same host.
+
 @item
 By default, @command{grep} applies each regexp to a line at a time,
 so the @samp{(?s)} directive (making @samp{.} match line breaks)

-----------------------------------------------------------------------

Summary of changes:
 doc/grep.texi | 6 ++++++
 1 file changed, 6 insertions(+)


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