qdapRegex (version 0.7.2)

rm_url: Remove/Replace/Extract URLs

Description

rm_url - Remove/replace/extract URLs from a string.

rm_twitter_url - Remove/replace/extract Twitter Short URLs from a string.

Usage

rm_url(text.var, trim = !extract, clean = TRUE, pattern = "@rm_url",
  replacement = "", extract = FALSE,
  dictionary = getOption("regex.library"), ...)
rm_twitter_url(text.var, trim = !extract, clean = TRUE,
  pattern = "@rm_twitter_url", replacement = "", extract = FALSE,
  dictionary = getOption("regex.library"), ...)
ex_url(text.var, trim = !extract, clean = TRUE, pattern = "@rm_url",
  replacement = "", extract = TRUE,
  dictionary = getOption("regex.library"), ...)
ex_twitter_url(text.var, trim = !extract, clean = TRUE,
  pattern = "@rm_twitter_url", replacement = "", extract = TRUE,
  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_url uses the rm_url regex from the regular expression dictionary from the dictionary argument.

replacement

Replacement for matched pattern.

extract

logical. If TRUE the URLs 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.

Value

Returns a character string with URLs removed.

Details

The default regex pattern "(http[^ ]*)|(www\.[^ ]*)" is more liberal. More constrained versions can be accessed via pattern = "@rm_url2" & pattern = "@rm_url3" see Examples).

References

The more constrained url regular expressions ("@rm_url2" and "@rm_url3" was adapted from imme_emosol's response: https://mathiasbynens.be/demo/url-regex

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_hash, 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_white, rm_zip

Examples

# NOT RUN {
x <- " I like www.talkstats.com and http://stackoverflow.com"
rm_url(x)
rm_url(x, replacement = '<a href="\\1" target="_blank">\\1</a>')
ex_url(x)

ex_url(x, pattern = "@rm_url2")
ex_url(x, pattern = "@rm_url3")

## Remove Twitter Short URL
x <- c("download file from http://example.com", 
         "this is the link to my website http://example.com", 
         "go to http://example.com from more info.",
         "Another url ftp://www.example.com",
         "And https://www.example.net",
         "twitter type: t.co/N1kq0F26tG",
         "still another one https://t.co/N1kq0F26tG :-)")

rm_twitter_url(x)
ex_twitter_url(x)

## Combine removing Twitter URLs and standard URLs
rm_twitter_n_url <- rm_(pattern=pastex("@rm_twitter_url", "@rm_url"))
rm_twitter_n_url(x)
rm_twitter_n_url(x, extract=TRUE)
# }

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