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  A list of the same length as \code{x}, the \code{i}-th element of which
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  A list of the same length as \code{x}, the \code{i}-th element of which
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  contains the vector of splits of \code{x[i]}.
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  contains the vector of splits of \code{x[i]}.
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  If any element of \code{x} or \code{split} is declared to be in UTF-8
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  If any element of \code{x} or \code{split} is declared to be in UTF-8
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  (see \code{\link{Encoding}}), all non-ASCII character strings in the
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  (see \code{\link{Encoding}}), all non-ASCII character strings in the
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  result will be in UTF-8 and have their encoding declared as UTF-8.  As
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  result will be in UTF-8 and have their encoding declared as UTF-8.
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  from \R 2.10.0, for \code{perl = TRUE, useBytes = FALSE} all non-ASCII
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  For \code{perl = TRUE, useBytes = FALSE} all non-ASCII strings in a
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  strings in a multibyte locale are translated to UTF-8.
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  multibyte locale are translated to UTF-8.
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}
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}
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\note{
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\note{
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  Prior to \R 2.11.0 there was an argument \code{extended} which could
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  Prior to \R 2.11.0 there was an argument \code{extended} which could
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  be used to select \sQuote{basic} regular expressions: this was often
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  be used to select \sQuote{basic} regular expressions: this was often
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  used when \code{fixed = TRUE} would be preferable.  In the actual
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  used when \code{fixed = TRUE} would be preferable.
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  implementation (as distinct from the POSIX standard) the only
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  difference was that \samp{?}, \samp{+}, \samp{\{}, \samp{|}, \samp{(},
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  and \samp{)} were not interpreted as metacharacters.
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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