currency {strex}

Extract currency amounts from a string.

Description

The currency of a number is defined as the character coming before the number in the string. If nothing comes before (i.e. if the number is the first thing in the string), the currency is the empty string, similarly the currency can be a space, comma or any manner of thing.

Usage

str_extract_currencies(string)

str_nth_currency(string, n)

str_first_currency(string)

str_last_currency(string)

Arguments

string

A character vector.

n

A vector of integerish values. Must be either length 1 or have length equal to the length of string. Negative indices count from the back: while n = 1 and n = 2 correspond to first and second, n = -1 and n = -2 correspond to last and second-last. n = 0 will return NA.

Details

These functions are vectorized over string and n.

str_extract_currencies() extracts all currency amounts.

str_nth_currency() just gets the nth currency amount from each string. str_first_currency(string) and str_last_currency(string) are just wrappers for str_nth_currency(string, n = 1) and str_nth_currency(string, n = -1).

"-$2.00" and "$-2.00" are interpreted as negative two dollars.

If you request e.g. the 5th currency amount but there are only 3 currency amounts, you get an amount and currency symbol of NA.

Value

A data frame with 4 columns: string_num, string, curr_sym and amount. Every extracted currency amount gets its own row in the data frame detailing the string number and string that it was extracted from, the currency symbol and the amount.

Examples

string <- c("ab3 13", "$1", "35.00 $1.14", "abc5 $3.8", "stuff")
str_extract_currencies(string)
str_nth_currency(string, n = 2)
str_nth_currency(string, n = -2)
str_nth_currency(string, c(1, -2, 1, 2, -1))
str_first_currency(string)
str_last_currency(string)