Remove/Replace/Extract Hash Tags

Usage

rm_hash(text.var, trim = !extract, clean = TRUE, pattern = "@rm_hash", replacement = "", extract = FALSE, dictionary = getOption("regex.library"), ...)

Arguments

text.var

The text variable.

trim

logical. If TRUE removes leading and trailing white spaces.

clean

trim logical. If TRUE extra white spaces and escaped character will be removed.

pattern

A character string containing a regular expression (or character string for fixed = TRUE) to be matched in the given character vector. Default, @rm_hash uses the rm_hash regex from the regular expression dictionary from the dictionary argument.

replacement

Replacement for matched pattern.

extract

logical. If TRUE the hash tags are extracted into a list of vectors.

dictionary

A dictionary of canned regular expressions to search within if pattern begins with "@rm_".

...

Other arguments passed to gsub.

Examples

x <- c("@hadley I like #rstats for #ggplot2 work.",
    "Difference between #magrittr and #pipeR, both implement pipeline operators for #rstats:
        http://renkun.me/r/2014/07/26/difference-between-magrittr-and-pipeR.html @timelyportfolio",
    "Slides from great talk: @ramnath_vaidya: Interactive slides from Interactive Visualization
        presentation #user2014. http://ramnathv.github.io/user2014-rcharts/#1"
)

rm_hash(x)

[1] "@hadley I like for work."                                                                                                                                  
[2] "Difference between and , both implement pipeline operators for : http://renkun.me/r/2014/07/26/difference-between-magrittr-and-pipeR.html @timelyportfolio"
[3] "Slides from great talk: @ramnath_vaidya: Interactive slides from Interactive Visualization presentation . http://ramnathv.github.io/user2014-rcharts/#1"   

rm_hash(rm_tag(x))

[1] "I like for work."                                                                                                                         
[2] "Difference between and , both implement pipeline operators for : http://renkun.me/r/2014/07/26/difference-between-magrittr-and-pipeR.html"
[3] "Slides from great talk: : Interactive slides from Interactive Visualization presentation . http://ramnathv.github.io/user2014-rcharts/#1" 

rm_hash(x, extract=TRUE)

[[1]]
[1] "#rstats"  "#ggplot2"

[[2]]
[1] "#magrittr" "#pipeR"    "#rstats"  

[[3]]
[1] "#user2014"



## remove just the hash symbol
rm_hash(x, replace="\\3")

[1] "@hadley I like rstats for ggplot2 work."                                                                                                                                       
[2] "Difference between magrittr and pipeR, both implement pipeline operators for rstats: http://renkun.me/r/2014/07/26/difference-between-magrittr-and-pipeR.html @timelyportfolio"
[3] "Slides from great talk: @ramnath_vaidya: Interactive slides from Interactive Visualization presentation user2014. http://ramnathv.github.io/user2014-rcharts/#1"               

See also

Author