replacec {lazy.tools}

R Documentation

Replace Characters by New Ones

Description

Replace Characters by New Ones

Usage

replacec(from, to, char, n = 1, start = 1, fixed = 1, ...)

Arguments

from	A character string to be replaced by "to". By default, there are no need to escape special characters.
to	A character string to replace "from".
char	A character vector where replacement occur.
n	# of times to replace
start	The location from which the replacement starts.
fixed	A parameter to be passed to gregexpr and gsub.
...	Additional parameters to gregexpr and gsub.

Details

Do not use regular expressions in from such as [a-b] etc.
When from does not contain regular expression,
fixed=0 and ignoe.case=1
should work.

Value

A string with replacement.

Examples

char <- paste( paste(letters,collapse=""),"0123456789",'"'
          , "'`!#$%&'()[]{}<>*+-,.;:/^~=_|", sep="", collapse="" )
lchar <- nchar(char)
char <- paste(char,char,char,sep=" ",collapse="")


# one to one
replacec( "b", "B", char )
replacec( "b", "B", char, 2 )
replacec( "b", "B", char, 1, 135)

# many to one
replacec( "bc", "B", char )
replacec( "bc", "B", char, 2 )
replacec( "bc", "B", char, 1, 135 )

# one to many
replacec( "b", "BC", char )
replacec( "b", "BC", char, 2 )
replacec( "b", "BC", char, 1, 135 )

# to null string
replacec( "b", "", char, 99 )

# special characters
replacec( "(", "[paren]", char )
replacec( "^", "[hat]", char )
replacec( "!#$", "[esd]", char )

# ignore.case
replacec("B","[B]",char, fixed=0, ignore.case=1 )

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