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  \item{value}{if \code{FALSE}, a vector containing the (\code{integer})
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  \item{value}{if \code{FALSE}, a vector containing the (\code{integer})
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    indices of the matches determined by \code{grep} is returned, and if
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    indices of the matches determined by \code{grep} is returned, and if
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    \code{TRUE}, a vector containing the matching elements themselves is
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    \code{TRUE}, a vector containing the matching elements themselves is
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    returned.}
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    returned.}
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  \item{fixed}{logical.  If \code{TRUE}, \code{pattern} is a string to be
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  \item{fixed}{logical.  If \code{TRUE}, \code{pattern} is a string to be
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    matched as is.  Overrides all other arguments.}
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    matched as is.  Overrides all other arguments.}
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  \item{replacement}{a replacement for matched pattern in \code{sub} and
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  \item{replacement}{a replacement for matched pattern in \code{sub} and
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    \code{gsub}.}
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    \code{gsub}.}
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}
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}
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\details{
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\details{
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  Arguments which should be character strings or character vectors are
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  Arguments which should be character strings or character vectors are
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  coerced to character if possible.
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  coerced to character if possible.
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  The two \code{*sub} functions differ only in that \code{sub} replaces
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  The two \code{*sub} functions differ only in that \code{sub} replaces
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  only the first occurrence of a \code{pattern} whereas \code{gsub}
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  only the first occurrence of a \code{pattern} whereas \code{gsub}
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  replaces all occurrences.
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  replaces all occurrences.
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  For \code{regexpr} it is an error for \code{pattern} to be \code{NA},
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  For \code{regexpr} it is an error for \code{pattern} to be \code{NA},
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole (\code{grep})
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  Wadsworth \& Brooks/Cole (\code{grep})
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}
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}
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\seealso{
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\seealso{
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  \link{regular expression} for the details of the pattern specification.
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  \link{regular expression} (aka \code{\link{regexp}}) for the details
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% the `aka' above is for ESS (and ?reg....) where a space is problematic
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  of the pattern specification.
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  \code{\link{agrep}} for approximate matching.
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  \code{\link{agrep}} for approximate matching.
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  \code{\link{tolower}}, \code{\link{toupper}} and \code{\link{chartr}}
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  \code{\link{tolower}}, \code{\link{toupper}} and \code{\link{chartr}}
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  for character translations.
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  for character translations.
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  \code{\link{charmatch}}, \code{\link{pmatch}}, \code{\link{match}}.
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  \code{\link{charmatch}}, \code{\link{pmatch}}, \code{\link{match}}.
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  \code{\link[utils]{apropos}} uses regexps and has nice examples.
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  \code{\link[utils]{apropos}} uses regexps and has nice examples.
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}
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}