add warning on use of unnamed args

git-svn-id: https://svn.r-project.org/R/trunk@87828 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: ripley

src/library/base/man/grep.Rd

@@ -1,6 +1,6 @@
 % File src/library/base/man/grep.Rd
 % Part of the R package, https://www.R-project.org
-% Copyright 1995-2022 R Core Team
+% Copyright 1995-2025 R Core Team
 % Distributed under GPL 2 or later
 
 \name{grep}
@@ -286,6 +286,13 @@ gregexec(pattern, text, ignore.case = FALSE, perl = FALSE,
   in 8-bit encodings can differ considerably between platforms, modes
   and from the UTF-8 versions.
 }
+\section{Warning}{
+  An all too cmmmon mis-usage is to pass unnamed arguments which are then
+  matched to one or more of \code{ignore.case}, \code{perl}, \code{value},
+  \code{fixed}, \code{useBytes}  and \code{invert}.  So it is good
+  practice to name all  the arguments (especially as
+  \code{x}/\code{text} is not the first argument).
+}
 
 \references{
   Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)

src/library/base/man/grepRaw.Rd

@@ -1,6 +1,6 @@
 % File src/library/base/man/grepRaw.Rd
 % Part of the R package, https://www.R-project.org
-% Copyright 1995-2016 R Core Team
+% Copyright 1995-2025 R Core Team
 % Distributed under GPL 2 or later
 
 \name{grepRaw}
@@ -73,6 +73,14 @@ grepRaw(pattern, x, offset = 1L, ignore.case = FALSE,
   is used except for \code{fixed = TRUE}.
 }
 
+\section{Warning}{
+  An all too cmmmon mis-usage is to pass unnamed arguments which are then
+  matched to one or more of \code{ignore.case}, \code{value},
+  \code{fixed}, \code{all} or \code{invert}.  So it is good practice to
+  name all the arguments.
+}
+
+
 % the `aka' below is for ESS
 \seealso{
   \link{regular expression} (aka \code{\link{regexp}}) for the details

src/library/base/man/strsplit.Rd

@@ -1,6 +1,6 @@
 % File src/library/base/man/strsplit.Rd
 % Part of the R package, https://www.R-project.org
-% Copyright 1995-2024 R Core Team
+% Copyright 1995-2024=5 R Core Team
 % Distributed under GPL 2 or later
 
 \name{strsplit}
@@ -104,6 +104,13 @@ strsplit(x, split, fixed = FALSE, perl = FALSE, useBytes = FALSE)
   substituted invalid bytes.
 }
 
+\section{Warning}{
+  An all too cmmmon mis-usage is to pass unnamed arguments which are then
+  matched to one or more of \code{fixed},
+  \code{perl} and \code{useBytes}.  So it is good
+  practice to name all  the arguments.
+}
+
 \seealso{
   \code{\link{paste}} for the reverse,
   \code{\link{grep}} and \code{\link{sub}} for string search and