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Rev 28442 Rev 32685
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  A missing value of \code{split} does not split the the corresponding
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  A missing value of \code{split} does not split the the corresponding
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  element(s) of \code{x} at all.
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  element(s) of \code{x} at all.
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}
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}
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\section{Warning}{
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\section{Warning}{
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  The standard regular expression code has been reported to be very slow
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  The standard regular expression code has been reported to be very slow
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  or give errors when applied to extremely long character strings
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  when applied to extremely long character strings
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  (tens of thousands of characters or more): the code used when
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  (tens of thousands of characters or more): the code used when
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  \code{perl=TRUE} seems faster and more reliable for such usages.
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  \code{perl=TRUE} seems much faster and more reliable for such usages.
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  The \code{perl = TRUE} option is only implemented for singlebyte and
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  UTF-8 encodings, and will warn if used in a non-UTF-8 multibyte locale.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{paste}} for the reverse,
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  \code{\link{paste}} for the reverse,
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  \code{\link{grep}} and \code{\link{sub}} for string search and
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  \code{\link{grep}} and \code{\link{sub}} for string search and
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  manipulation; further \code{\link{nchar}}, \code{\link{substr}}.
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  manipulation; further \code{\link{nchar}}, \code{\link{substr}}.