quanteda tokenizers

Internal methods for tokenization providing default and legacy methods for text segmentation.

Usage

tokenize_word2(
  x,
  split_hyphens = FALSE,
  verbose = quanteda_options("verbose"),
  ...
)

tokenize_word3(
  x,
  split_hyphens = FALSE,
  verbose = quanteda_options("verbose"),
  ...
)

tokenize_word4(
  x,
  split_hyphens = FALSE,
  split_tags = FALSE,
  split_elisions = FALSE,
  verbose = quanteda_options("verbose"),
  ...
)

tokenize_word1(
  x,
  split_hyphens = FALSE,
  verbose = quanteda_options("verbose"),
  ...
)

tokenize_character(x, ...)

tokenize_sentence(x, verbose = FALSE, ...)

tokenize_paragraph(x, verbose = FALSE, ...)

tokenize_fasterword(x, ...)

tokenize_fastestword(x, ...)

normalize_characters(x)

Arguments

x

(named) character; input texts

split_hyphens

logical; if FALSE, do not split words that are connected by hyphenation and hyphenation-like characters in between words, e.g. "self-aware" becomes c("self", "-", "aware")

verbose

if TRUE, print timing messages to the console.

...

used to pass arguments among the functions.

split_tags

logical; if FALSE, do not split social media tags defined in quanteda_options(). The default patterns are pattern_hashtag = "#\\w+#?" and pattern_username = "@[a-zA-Z0-9_]+".

Value

a list of characters corresponding to the (most conservative) tokenization, including whitespace where applicable; except for tokenize_word1(), which is a special tokenizer for Internet language that includes URLs, #hashtags, @usernames, and email addresses.

Details

Each of the word tokenizers corresponds to a major version of quanteda, kept here for backward compatibility and comparison. tokenize_word3() is identical to tokenize_word2().

Examples

if (FALSE) { # \dontrun{
txt <- c(doc1 = "Tweet https://quanteda.io using @quantedainit and #rstats.",
         doc2 = "The £1,000,000 question.",
         doc4 = "Line 1.\nLine2\n\nLine3.",
         doc5 = "?",
         doc6 = "Self-aware machines! \U0001f600",
         doc7 = "Qu'est-ce que c'est?")
tokenize_word2(txt)
tokenize_word2(txt, split_hyphens = FALSE)
tokenize_word1(txt, split_hyphens = FALSE)
tokenize_word4(txt, split_hyphens = FALSE, split_elisions = TRUE)
tokenize_fasterword(txt)
tokenize_fastestword(txt)
tokenize_sentence(txt)
tokenize_character(txt[2])
} # }