qdapRegex (version 0.7.8)

rm_hash: Remove/Replace/Extract Hash Tags

Description

Remove/replace/extract hash tags from a string.

Usage

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

Value

Returns a character string with hash tags removed.

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.

Author

stackoverflow's hwnd and Tyler Rinker <[e-mail]>.

References

The hash tag regular expression was taken from: https://stackoverflow.com/a/25096474/1000343

See Also

gsub, stri_extract_all_regex

Other rm_ functions: rm_abbreviation(), rm_between(), rm_bracket(), rm_caps_phrase(), rm_caps(), rm_citation_tex(), rm_citation(), rm_city_state_zip(), rm_city_state(), rm_date(), rm_default(), rm_dollar(), rm_email(), rm_emoticon(), rm_endmark(), rm_nchar_words(), rm_non_ascii(), rm_non_words(), rm_number(), rm_percent(), rm_phone(), rm_postal_code(), rm_repeated_characters(), rm_repeated_phrases(), rm_repeated_words(), rm_tag(), rm_time(), rm_title_name(), rm_url(), rm_white(), rm_zip()

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)
rm_hash(rm_tag(x))
ex_hash(x)

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