ugc_cased_letter: Unicode General Categories

Description

Match a Unicode General Category.

Usage

ugc_cased_letter(lo, hi, char_class = TRUE)
ugc_close_punctuation(lo, hi, char_class = TRUE)
ugc_connector_punctuation(lo, hi, char_class = TRUE)
ugc_control(lo, hi, char_class = TRUE)
ugc_currency_symbol(lo, hi, char_class = TRUE)
ugc_dash_punctuation(lo, hi, char_class = TRUE)
ugc_decimal_number(lo, hi, char_class = TRUE)
ugc_enclosing_mark(lo, hi, char_class = TRUE)
ugc_final_punctuation(lo, hi, char_class = TRUE)
ugc_format_control(lo, hi, char_class = TRUE)
ugc_initial_punctuation(lo, hi, char_class = TRUE)
ugc_letter(lo, hi, char_class = TRUE)
ugc_letter_number(lo, hi, char_class = TRUE)
ugc_line_separator(lo, hi, char_class = TRUE)
ugc_lowercase_letter(lo, hi, char_class = TRUE)
ugc_mark(lo, hi, char_class = TRUE)
ugc_math_symbol(lo, hi, char_class = TRUE)
ugc_modifier_letter(lo, hi, char_class = TRUE)
ugc_modifier_symbol(lo, hi, char_class = TRUE)
ugc_nonspacing_mark(lo, hi, char_class = TRUE)
ugc_number(lo, hi, char_class = TRUE)
ugc_open_punctuation(lo, hi, char_class = TRUE)
ugc_other(lo, hi, char_class = TRUE)
ugc_other_letter(lo, hi, char_class = TRUE)
ugc_other_number(lo, hi, char_class = TRUE)
ugc_other_punctuation(lo, hi, char_class = TRUE)
ugc_other_symbol(lo, hi, char_class = TRUE)
ugc_paragraph_separator(lo, hi, char_class = TRUE)
ugc_private_use_control(lo, hi, char_class = TRUE)
ugc_punctuation(lo, hi, char_class = TRUE)
ugc_separator(lo, hi, char_class = TRUE)
ugc_space_separator(lo, hi, char_class = TRUE)
ugc_spacing_mark(lo, hi, char_class = TRUE)
ugc_surrogate_control(lo, hi, char_class = TRUE)
ugc_symbol(lo, hi, char_class = TRUE)
ugc_titlecase_letter(lo, hi, char_class = TRUE)
ugc_unassigned_control(lo, hi, char_class = TRUE)
ugc_uppercase_letter(lo, hi, char_class = TRUE)
UGC_UPPERCASE_LETTER
UGC_LOWERCASE_LETTER
UGC_TITLECASE_LETTER
UGC_CASED_LETTER
UGC_MODIFIER_LETTER
UGC_OTHER_LETTER
UGC_LETTER
UGC_NONSPACING_MARK
UGC_SPACING_MARK
UGC_ENCLOSING_MARK
UGC_MARK
UGC_DECIMAL_NUMBER
UGC_LETTER_NUMBER
UGC_OTHER_NUMBER
UGC_NUMBER
UGC_CONNECTOR_PUNCTUATION
UGC_DASH_PUNCTUATION
UGC_OPEN_PUNCTUATION
UGC_CLOSE_PUNCTUATION
UGC_INITIAL_PUNCTUATION
UGC_FINAL_PUNCTUATION
UGC_OTHER_PUNCTUATION
UGC_PUNCTUATION
UGC_MATH_SYMBOL
UGC_CURRENCY_SYMBOL
UGC_MODIFIER_SYMBOL
UGC_OTHER_SYMBOL
UGC_SYMBOL
UGC_SPACE_SEPARATOR
UGC_LINE_SEPARATOR
UGC_PARAGRAPH_SEPARATOR
UGC_SEPARATOR
UGC_CONTROL
UGC_FORMAT_CONTROL
UGC_SURROGATE_CONTROL
UGC_PRIVATE_USE_CONTROL
UGC_UNASSIGNED_CONTROL
UGC_OTHER

Value

A character vector representing part or all of a regular expression.

Format

An object of class regex (inherits from character) of length 1.

Arguments

lo: A non-negative integer. Minimum number of repeats, when grouped.
hi: positive integer. Maximum number of repeats, when grouped.
char_class: TRUE or FALSE. Should the values be wrapped into a character class?

References

Table 12 of the Unicode Standard Annex #44 defines the Unicode General Categories. http://www.unicode.org/reports/tr44

You can see which characters are contained in a category by visiting, e.g., http://www.fileformat.info/info/unicode/category/Nd/list.htm

Examples

Run this code

# Classes
ugc_lowercase_letter()
ugc_decimal_number()
ugc_paragraph_separator()
ugc_currency_symbol()

# With repetition
ugc_nonspacing_mark(3, 6)
ugc_separator(1, Inf)
ugc_dash_punctuation(0, Inf)

# Without a class wrapper
ugc_titlecase_letter(char_class = FALSE)

# Constants
UGC_UPPERCASE_LETTER
UGC_LETTER_NUMBER
UGC_MATH_SYMBOL
UGC_FORMAT_CONTROL

if (FALSE) {
# All the Unicode general categories.
# Not run, since it generates lots of output
ls("package:rebus.unicode", pattern = "^ugc")
}

# Usage
library(rebus.base)
x <- "I exchanged $1000 for \u20ac665.41 and \u00a3243.13."
(rx <- capture(ugc_currency_symbol()) %R% 
  capture(
    ugc_decimal_number(1, Inf) %R%
    optional(group("." %R% ugc_decimal_number(2)))
  )
)
stringi::stri_match_all_regex(x, rx)

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