strextr: Extract a Substring

Description Usage Arguments Details Value Author(s) Examples

View source: R/strextr.R

Description

This function extracts substring(s) which match a given pattern.

Usage

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strextr(x, pattern, sep = " ", mult = F, unlist = F, cores = 1)

Arguments

x

Character vector.

pattern

Regular expression.

sep

Character string which separates the fields.

mult

Logical, if multiple matching fields should be returned, or otherwise NA.

unlist

Logical, unlists multiple results.

cores

Integer for number of computational cores to use.

Details

The function is deprecated and will be removed with miscset version 2. It is recommended to use str_extract or str_extract_all instead.

Value

A list of character vectors containing the substrings that are matching pattern and are separated by sep or NA if the pattern could not be found.

Author(s)

Sven E. Templer

Examples

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#

library(stringr)

s <- c("A1 B1 C1","A2 B2", "AA A1", "AA", "B1 A1", "BB AB A1")

strextr(s, "^[AB][[:digit:]]$") # deprecated
str_extract(s, "[AB][:digit:]")

strextr(s, "^[AB][[:digit:]]$", mult = TRUE) # deprecated
str_extract_all(s, "[AB][:digit:]")

strextr(s, "^[AB][[:digit:]]$", mult = TRUE, unlist = TRUE) # deprecated
unlist(str_extract_all(s, "[AB][:digit:]")) # has no <NA> values

strextr(s, "^[C][[:digit:]]$") # deprecated
str_extract(s, "[C][:digit:]")

#

miscset documentation built on May 29, 2017, 5:31 p.m.

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