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Diffstat (limited to 'doc/grep.texi')
| -rw-r--r-- | doc/grep.texi | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/doc/grep.texi b/doc/grep.texi index ce6d6dc0..ff31d5d2 100644 --- a/doc/grep.texi +++ b/doc/grep.texi @@ -1154,18 +1154,15 @@ For documentation, refer to @url{https://www.pcre.org/}, with these caveats: @samp{\d} matches only the ten ASCII digits (and @samp{\D} matches the complement), regardless of locale. Use @samp{\p@{Nd@}} to also match non-ASCII digits. - -When @command{grep} is built with PCRE2 10.42 and earlier, -@samp{\d} and @samp{\D} ignore in-regexp directives like @samp{(?aD)} -and work like @samp{[0-9]} and @samp{[^0-9]} respectively. -However, later versions of PCRE2 likely will fix this, -and the plan is for @command{grep} to respect those directives if possible. +(The behavior of @samp{\d} and @samp{\D} is unspecified after +in-regexp directives like @samp{(?aD)}.) @item Although PCRE tracks the syntax and semantics of Perl's regular -expressions, the match is not always exact, partly because Perl +expressions, the match is not always exact. For example, Perl evolves and a Perl installation may predate or postdate the PCRE2 -installation on the same host. +installation on the same host, or their Unicode versions may differ, +or Perl and PCRE2 may disagree about an obscure construct. @item By default, @command{grep} applies each regexp to a line at a time, |