str_detect: Detect a pattern in a character vector

In cobriant/qelp: Quick Help: Beginner friendly help docs for R and the Tidyverse

Detect a pattern in a character vector

Description

Use str_detect() to look for a pattern in a character vector. str_detect() will return a logical vector that is TRUE where the pattern was found and FALSE where the pattern was not found.

Usage

str_detect(string, pattern)

Examples

library(tidyverse)

# A character vector of names of fruits:

fruit <- c("apple", "banana", "pear", "pinapple")

# Detect the pattern "apple":

str_detect(fruit, "apple")

#> [1]  TRUE FALSE FALSE  TRUE

----------------------------------------

# Detect elements that start with a "p":

str_detect(fruit, "^p")

#> [1] FALSE FALSE  TRUE  TRUE

----------------------------------------

# Detect elements that end with an "e":

str_detect(fruit, "e$")

#> [1]  TRUE FALSE FALSE  TRUE

----------------------------------------

# `str_detect()` can also be used in
# conjunction with `filter()`:

fruit <- tibble(
  name = c("apple", "banana", "pear", "pinapple"),
  price = c(2.97, .63, 1.12, 2.68)
)

# Detect the pattern "appl":

fruit %>%
  filter(str_detect(name, "appl"))

#  A tibble: 2 x 2
#   name     price
#   <chr>    <dbl>
# 1 apple     2.97
# 2 pinapple  2.68

cobriant/qelp documentation built on July 1, 2022, 7:24 a.m.