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}
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}
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\details{
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\details{
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  Internally, \code{\link{sub}(re, "", *, perl = TRUE)}, i.e., PCRE
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  Internally, \code{\link{sub}(re, "", *, perl = TRUE)}, i.e., PCRE
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  library regular expressions are used.
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  library regular expressions are used.
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  For portability, the default \sQuote{whitespace} is the character class
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  For portability, the default \sQuote{whitespace} is the character class
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  \code{[ \\t\\r\\n]} (space, horizontal tab, carriage return,
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  \samp{[ \\t\\r\\n]} (space, horizontal tab, carriage return,
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  newline).  Alternatively, \code{[\\h\\v]} is a good (PCRE)
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  newline).  Alternatively, \samp{[\\h\\v]} is a good (PCRE)
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  generalization to match all Unicode horizontal and vertical white
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  generalization to match all Unicode horizontal and vertical white
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  space characters, see also \url{https://www.pcre.org}.
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  space characters, see also \url{https://www.pcre.org}.
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}
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}
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\examples{
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\examples{
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x <- "  Some text. "
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x <- "  Some text. "