rebus.base (version 0.0-3)

capture: Capture a token, or not

Description

Create a token to capture or not.

Usage

capture(x)
group(x)
token(x)
engroup(x, capture)

Arguments

x

A character vector.

capture

Logical If TRUE, call capture; if FALSE, call group.

Value

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

References

http://www.regular-expressions.info/brackets.html

See Also

or for more examples

Examples

x <- "foo"
capture(x)
group(x)

# Usage
# capture is good with match functions
(rx_price <- capture(digit(1, Inf) %R% DOT %R% digit(2)))
(rx_quantity <- capture(digit(1, Inf)))
(rx_all <- DOLLAR %R% rx_price %R% " for " %R% rx_quantity)
stringi::stri_match_first_regex("The price was $123.99 for 12.", rx_all)

# group is mostly used with alternation.  See ?or.
(rx_spread <- group("peanut butter" %|% "jam" %|% "marmalade"))
stringi::stri_extract_all_regex(
  "You can have peanut butter, jam, or marmalade on your toast.",
  rx_spread
)