Class Constants
Match a class of values. These are typically used in combination with
char_class to create new character classes.
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
An object of class regex (inherits from character) of length 1.
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.
# 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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.