character_class: Create character classes
In rex: Friendly Regular Expressions

Description Usage Arguments Functions See Also Examples

There are multiple ways you can define a character class.

character_class(x)

one_of(...)

any_of(..., type = c("greedy", "lazy", "possessive"))

some_of(..., type = c("greedy", "lazy", "possessive"))

none_of(...)

except_any_of(..., type = c("greedy", "lazy", "possessive"))

except_some_of(..., type = c("greedy", "lazy", "possessive"))

range(start, end)

`:`(start, end)

exclude_range(start, end)

`x`	text to include in the character class (must be escaped manually)
`...`	`shortcuts`, R variables, text, or other rex functions.
`type`	the type of match to perform. There are three match types `greedy`: match the longest string. This is the default matching type. `lazy`: match the shortest string. This matches the shortest string from the same anchor point, not necessarily the shortest global string. `possessive`: match and don't allow backtracking
`start`	beginning of character class
`end`	end of character class

character_class: explicitly define a character class
one_of: matches one of the specified characters.
any_of: matches zero or more of the specified characters.
some_of: matches one or more of the specified characters.
none_of: matches anything but one of the specified characters.
except_any_of: matches zero or more of anything but the specified characters.
except_some_of: matches one or more of anything but the specified characters.
range: matches one of any of the characters in the range.
:: matches one of any of the characters in the range.
exclude_range: matches one of any of the characters except those in the range.

Other rex: %or%(), capture(), counts, group(), lookarounds, not(), rex(), shortcuts, wildcards

# grey = gray
re <- rex("gr", one_of("a", "e"), "y")
grepl(re, c("grey", "gray")) # TRUE TRUE

# Match non-vowels
re <- rex(none_of("a", "e", "i", "o", "u"))
# They can also be in the same string
re <- rex(none_of("aeiou"))
grepl(re, c("k", "l", "e")) # TRUE TRUE FALSE

# Match range
re <- rex(range("a", "e"))
grepl(re, c("b", "d", "f")) # TRUE TRUE FALSE

# Explicit creation
re <- rex(character_class("abcd\\["))
grepl(re, c("a", "d", "[", "]")) # TRUE TRUE TRUE FALSE