stringr

A fresh approach to string manipulation in R

https://github.com/tidyverse/stringr

Science Score: 23.0%

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Low similarity (19.5%) to scientific vocabulary

Keywords

r regular-expression strings

Keywords from Contributors

tidy-data data-manipulation grammar visualisation tidyverse documentation-tool ropensci date-time pandoc rmarkdown

Last synced: 6 months ago · JSON representation

Repository

A fresh approach to string manipulation in R

Basic Info

Host: GitHub
Owner: tidyverse
License: other
Language: R
Default Branch: main
Homepage: https://stringr.tidyverse.org
Size: 5.72 MB

Statistics

Stars: 640
Watchers: 36
Forks: 191
Open Issues: 12
Releases: 9

Topics

r regular-expression strings

Created over 16 years ago · Last pushed over 1 year ago

Metadata Files

Readme Changelog License Code of conduct

README.Rmd

---
output: github_document
---



```{r, include = FALSE}
knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.path = "README-"
)
library(stringr)
```

# stringr 


[![CRAN status](https://www.r-pkg.org/badges/version/stringr)](https://cran.r-project.org/package=stringr)
[![R-CMD-check](https://github.com/tidyverse/stringr/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/tidyverse/stringr/actions/workflows/R-CMD-check.yaml)
[![Codecov test coverage](https://codecov.io/gh/tidyverse/stringr/branch/main/graph/badge.svg)](https://app.codecov.io/gh/tidyverse/stringr?branch=main)
[![Lifecycle: stable](https://img.shields.io/badge/lifecycle-stable-brightgreen.svg)](https://lifecycle.r-lib.org/articles/stages.html#stable)


## Overview

Strings are not glamorous, high-profile components of R, but they do play a big role in many data cleaning and preparation tasks. The stringr package provides a cohesive set of functions designed to make working with strings as easy as possible. If you're not familiar with strings, the best place to start is the [chapter on strings](https://r4ds.hadley.nz/strings) in R for Data Science.

stringr is built on top of [stringi](https://github.com/gagolews/stringi), which uses the [ICU](https://icu.unicode.org) C library to provide fast, correct implementations of common string manipulations. stringr focusses on the most important and commonly used string manipulation functions whereas stringi provides a comprehensive set covering almost anything you can imagine. If you find that stringr is missing a function that you need, try looking in stringi. Both packages share similar conventions, so once you've mastered stringr, you should find stringi similarly easy to use.

## Installation

```r
# The easiest way to get stringr is to install the whole tidyverse:
install.packages("tidyverse")

# Alternatively, install just stringr:
install.packages("stringr")
```

## Cheatsheet

  

## Usage

All functions in stringr start with `str_` and take a vector of strings as the first argument:

```{r}
x <- c("why", "video", "cross", "extra", "deal", "authority")
str_length(x) 
str_c(x, collapse = ", ")
str_sub(x, 1, 2)
```

Most string functions work with regular expressions, a concise language for describing patterns of text. For example, the regular expression `"[aeiou]"` matches any single character that is a vowel:

```{r}
str_subset(x, "[aeiou]")
str_count(x, "[aeiou]")
```

There are seven main verbs that work with patterns:

*   `str_detect(x, pattern)` tells you if there's any match to the pattern:
    ```{r}
    str_detect(x, "[aeiou]")
    ```
    
*   `str_count(x, pattern)` counts the number of patterns:
    ```{r}
    str_count(x, "[aeiou]")
    ```

*   `str_subset(x, pattern)` extracts the matching components:
    ```{r}
    str_subset(x, "[aeiou]")
    ```

*   `str_locate(x, pattern)` gives the position of the match:
    ```{r}
    str_locate(x, "[aeiou]")
    ```

*   `str_extract(x, pattern)` extracts the text of the match:
    ```{r}
    str_extract(x, "[aeiou]")
    ```

*   `str_match(x, pattern)` extracts parts of the match defined by parentheses:
    ```{r}
    # extract the characters on either side of the vowel
    str_match(x, "(.)[aeiou](.)")
    ```

*   `str_replace(x, pattern, replacement)` replaces the matches with new text:
    ```{r}
    str_replace(x, "[aeiou]", "?")
    ```

*   `str_split(x, pattern)` splits up a string into multiple pieces:
    ```{r}
    str_split(c("a,b", "c,d,e"), ",")
    ```

As well as regular expressions (the default), there are three other pattern matching engines:

* `fixed()`: match exact bytes
* `coll()`: match human letters
* `boundary()`: match boundaries

## RStudio Addin

The [RegExplain RStudio addin](https://www.garrickadenbuie.com/project/regexplain/) provides a friendly interface for working with regular expressions and functions from stringr. This addin allows you to interactively build your regexp, check the output of common string matching functions, consult the interactive help pages, or use the included resources to learn regular expressions.

This addin can easily be installed with devtools:

```r
# install.packages("devtools")
devtools::install_github("gadenbuie/regexplain")
```

## Compared to base R

R provides a solid set of string operations, but because they have grown organically over time, they can be inconsistent and a little hard to learn. Additionally, they lag behind the string operations in other programming languages, so that some things that are easy to do in languages like Ruby or Python are rather hard to do in R. 

* Uses consistent function and argument names. The first argument is always
  the vector of strings to modify, which makes stringr work particularly well
  in conjunction with the pipe:
  
    ```{r}
    letters %>%
      .[1:10] %>% 
      str_pad(3, "right") %>%
      str_c(letters[2:11])
    ```

* Simplifies string operations by eliminating options that you don't need
  95% of the time.

* Produces outputs than can easily be used as inputs. This includes ensuring
  that missing inputs result in missing outputs, and zero length inputs
  result in zero length outputs.
  
Learn more in `vignette("from-base")`

Owner

Name: tidyverse
Login: tidyverse
Kind: organization

Website: http://tidyverse.org
Repositories: 43
Profile: https://github.com/tidyverse

The tidyverse is a collection of R packages that share common principles and are designed to work together seamlessly

GitHub Events

Total

Issues event: 7
Watch event: 34
Issue comment event: 15
Push event: 3
Pull request review event: 3
Pull request review comment event: 9
Pull request event: 7
Fork event: 8

Last Year

Issues event: 7
Watch event: 34
Issue comment event: 15
Push event: 3
Pull request review event: 3
Pull request review comment event: 9
Pull request event: 7
Fork event: 8

Committers

Last synced: 8 months ago

All Time

Total Commits: 623
Total Committers: 81
Avg Commits per committer: 7.691
Development Distribution Score (DDS): 0.207

Past Year

Commits: 20
Committers: 12
Avg Commits per committer: 1.667
Development Distribution Score (DDS): 0.7

Top Committers

Name	Email	Commits
hadley	h**m@g**m	494
Jennifer (Jenny) Bryan	j**n@g**m	8
Mara Averick	m**k@g**m	7
gagolews	e**y@g**m	7
Stefan Milton Bache	s**n@s**k	6
Raymond Patterson	r**5@g**m	6
Chel Hee Lee	g**s@g**m	4
Hiroaki Yutani	y**i@g**m	4
edward-burn	9****n	4
Jon Harmon	3****k	3
Y. Yu	5****e	2
TJ Mahr	t****r	2
Michael Chirico	c**m@g**m	2
Shian Su	r**u@g**m	2
Gábor Csárdi	c**r@g**m	2
Derek Chiu	d**u@b**a	2
Clayton Yochum	c**y@g**m	2
Christopher Gandrud	c**d@g**m	2
Salim B	g**t@s**e	2
Edgar Zamora	e**a@p**m	1
Floris Vanderhaeghe	f**e@i**e	1
Garrick Aden-Buie	g**e@m**u	1
Hugo Gruson	B****o	1
J. Allen Baron	j**d@g**m	1
Jacob Peacock	j**9@g**m	1
James Howison	j**s@h**e	1
Jesica Formoso	3****o	1
Jim Hester	j**r@g**m	1
Chenliang Xu	l**m@g**m	1
Carl Ganz	c**z@c**u	1
and 51 more...

Committer Domains (Top 20 + Academic)

google.com: 2 stefanbache.dk: 1 bccrc.ca: 1 salim.space: 1 powerschool.com: 1 inbo.be: 1 mail.usf.edu: 1 howison.name: 1 colorado.edu: 1 pirategrunt.com: 1 chl072.(none): 1 exegetic.biz: 1 berkeley.edu: 1 asu.edu: 1 vivaldi.net: 1 bio.uib.no: 1 barrows.io: 1 fishandwhistle.net: 1 europa-uni.de: 1 lincolnmullen.com: 1

Issues and Pull Requests

Last synced: 6 months ago

All Time

Total issues: 113
Total pull requests: 63
Average time to close issues: 3 months
Average time to close pull requests: about 1 month
Total issue authors: 80
Total pull request authors: 29
Average comments per issue: 1.5
Average comments per pull request: 0.68
Merged pull requests: 46
Bot issues: 0
Bot pull requests: 0

Past Year

Issues: 8
Pull requests: 9
Average time to close issues: 23 days
Average time to close pull requests: 7 months
Issue authors: 8
Pull request authors: 6
Average comments per issue: 1.0
Average comments per pull request: 0.11
Merged pull requests: 2
Bot issues: 0
Bot pull requests: 0

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Top Authors

Issue Authors

hadley (31)
DanChaltiel (3)
jzadra (2)
Fred-Wu (1)
davidhodge931 (1)
Dannyzhd (1)
mkvasnicka (1)
leowill01 (1)
MiguelCos (1)
bfordAIMS (1)
LukasWallrich (1)
wurli (1)
Ax3man (1)
eauleaf (1)
MattCowgill (1)

Pull Request Authors

hadley (17)
jennybc (5)
salim-b (5)
edward-burn (5)
matthewjnield (2)
krlmlr (2)
UchidaMizuki (2)
Rekyt (2)
PursuitOfDataScience (2)
VisruthSK (2)
arnaudgallou (1)
JBGruber (1)
librill (1)
kylebutts (1)
MichaelChirico (1)

Top Labels

Issue Labels

documentation (9) tidy-dev-day :nerd_face: (8) feature (5) bug (4) upkeep (2) reprex (1)

Pull Request Labels

breaking change :skull_and_crossbones: (2) tidy-dev-day :nerd_face: (1) upkeep (1)

Packages

Total packages: 3
Total downloads:
- cran 978,741 last-month
Total docker downloads: 177,795,351

Total dependent packages: 2,514
(may contain duplicates)
Total dependent repositories: 12,334
(may contain duplicates)
Total versions: 33
Total maintainers: 1

cran.r-project.org: stringr

Simple, Consistent Wrappers for Common String Operations

Homepage: https://stringr.tidyverse.org
Documentation: http://cran.r-project.org/web/packages/stringr/stringr.pdf
License: MIT + file LICENSE
Latest release: 1.5.2
published 6 months ago

Versions: 18
Dependent Packages: 2,302
Dependent Repositories: 12,198
Downloads: 978,741 Last month
Docker Downloads: 177,795,351

Rankings

Dependent repos count: 0.0%

Dependent packages count: 0.0%

Downloads: 0.1%

Forks count: 0.3%

Stargazers count: 0.6%

Average: 3.1%

Docker downloads count: 17.3%

Maintainers (1)

hadley@posit.co

Last synced: 6 months ago

proxy.golang.org: github.com/tidyverse/stringr

Documentation: https://pkg.go.dev/github.com/tidyverse/stringr#section-documentation
License: other
Latest release: v1.5.1
published over 2 years ago

Versions: 9
Dependent Packages: 0
Dependent Repositories: 0

Rankings

Dependent packages count: 5.5%

Average: 5.7%

Dependent repos count: 5.9%

Last synced: 6 months ago

conda-forge.org: r-stringr

Homepage: https://stringr.tidyverse.org
License: MIT
Latest release: 1.4.1
published over 3 years ago

Versions: 6
Dependent Packages: 212
Dependent Repositories: 136

Rankings

Dependent packages count: 0.3%

Dependent repos count: 2.9%

Average: 8.5%

Forks count: 13.7%

Stargazers count: 17.0%

Last synced: 6 months ago

Dependencies

DESCRIPTION cran

R >= 3.3 depends
cli * imports
ellipsis * imports
glue >= 1.6.1 imports
lifecycle * imports
magrittr * imports
rlang * imports
stringi >= 1.5.3 imports
vctrs * imports
withr * imports
covr * suggests
htmltools * suggests
htmlwidgets * suggests
knitr * suggests
rmarkdown * suggests
testthat >= 3.0.0 suggests

.github/workflows/R-CMD-check.yaml actions

actions/checkout v2 composite
r-lib/actions/check-r-package v2 composite
r-lib/actions/setup-pandoc v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/pkgdown.yaml actions

actions/checkout v2 composite
r-lib/actions/setup-pandoc v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/pr-commands.yaml actions

actions/checkout v2 composite
r-lib/actions/pr-fetch v2 composite
r-lib/actions/pr-push v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite

.github/workflows/test-coverage.yaml actions

actions/checkout v2 composite
r-lib/actions/setup-r v2 composite
r-lib/actions/setup-r-dependencies v2 composite