str_extract_before_date: Extract characters in a string which occur before a date

In johncassil/stringr.plus: string functions that are "too specific for stringr" for Hadley Wickham

Description

Vectorised over 'string' and 'date_sep'.

Usage

str_extract_before_date(string, date_sep = "", format = "num", num_char = NULL)

Arguments

string	The string from which to extract.
date_sep	Character symbol seperating the components of the date.
format	The format of the date in the string. Must be one of 'num' (year-month-day, month-day-year, or day-month-year with all numerical components), 'mdy-abbr' (month-day-year, abbreviated month name), 'dmy-abbr' (day-month-year, abbreviated month name), 'mdy-full' (month-day-year, full month name), or dmy-full' (day-month-year, full month name).
num_char	The number of characters to return from before the pattern. Leave NULL to return everything before the pattern.

Value

The part of the string before the pattern.

Examples

test_string <- 'url.com/string_before_pattern_2020_08_01/index.html'
str_extract_before_date(string = test_string, date_sep = "_")
str_extract_before_date(string = test_string, date_sep = "_", num_char = 21)

test_string <- 'really-long-file-name-12-31-2020.csv'
str_extract_before_date(string = test_string, date_sep = "-")

test_string <- 'really-long-file-name-Mar-18-2018.csv'
str_extract_before_date(string = test_string, date_sep = "-", format = "mdy-abbr")

test_string <- 'really-long-file-name-March-18-2018.csv'
str_extract_before_date(string = test_string, date_sep = "-", format = "mdy-full")

test_string <- 'really-long-file-name-28-Mar-2018.csv'
str_extract_before_date(string = test_string, date_sep = "-", format = "dmy-abbr")

test_string <- 'really-long-file-name-28-March-2018.csv'
str_extract_before_date(string = test_string, date_sep = "-", format = "dmy-full")

johncassil/stringr.plus documentation built on Oct. 9, 2021, 7:56 p.m.