CharacterClasses {rebus.base}

Class Constants

Description

Match a class of values. These are typically used in combination with char_class to create new character classes.

Usage

ALPHA

ALNUM

BLANK

CNTRL

DIGIT

GRAPH

LOWER

PRINT

PUNCT

SPACE

UPPER

HEX_DIGIT

ANY_CHAR

GRAPHEME

NEWLINE

DGT

WRD

SPC

NOT_DGT

NOT_WRD

NOT_SPC

ASCII_DIGIT

ASCII_LOWER

ASCII_UPPER

ASCII_ALPHA

ASCII_ALNUM

UNMATCHABLE

Format

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

See Also

ClassGroups for the functional form, SpecialCharacters for regex metacharacters, Anchors for constants to match the start/end of a string, WordBoundaries for contants to match the start/end of a word.

Examples

# R character classes
ALNUM
ALPHA
BLANK
CNTRL
DIGIT
GRAPH
LOWER
PRINT
PUNCT
SPACE
UPPER
HEX_DIGIT

# Special chars
ANY_CHAR
GRAPHEME
NEWLINE

# Generic classes
DGT
WRD
SPC

# Generic negated classes
NOT_DGT
NOT_WRD
NOT_SPC

# Non-locale-specific classes
ASCII_DIGIT
ASCII_LOWER
ASCII_UPPER
ASCII_ALPHA
ASCII_ALNUM

# An oxymoron
UNMATCHABLE

# Usage
x <- c("a1 A", "a1 a")
rx <- LOWER %R% DIGIT %R% SPACE %R% UPPER
stringi::stri_detect_regex(x, rx)