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  If \code{invert} is \code{TRUE} (default), \code{regmatches} extracts
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  If \code{invert} is \code{TRUE} (default), \code{regmatches} extracts
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  the matched substrings as specified by the match data.  For vector
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  the matched substrings as specified by the match data.  For vector
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  match data (as obtained from \code{\link{regexpr}}), empty matches are
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  match data (as obtained from \code{\link{regexpr}}), empty matches are
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  dropped; for list match data, empty matches give empty components
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  dropped; for list match data, empty matches give empty components
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  (zero-length character vectors).
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  (zero-length character vectors).
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  If \code{invert} is \code{FALSE}, \code{regmatches} extracts the
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  If \code{invert} is \code{FALSE}, \code{regmatches} extracts the
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  non-matched substrings, i.e., the strings are split according to the
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  non-matched substrings, i.e., the strings are split according to the
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  matches similar to \code{\link{strsplit}} (for vector match data, at
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  matches similar to \code{\link{strsplit}} (for vector match data, at
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  most a single split is performed).
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  most a single split is performed).
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