Overview
strs is an R package that provides a comprehensive set of string manipulation functions, mirroring the functionality and naming conventions of Python’s str methods. It aims to make string operations in R more accessible for users familiar with Python. Under the hood, every function uses the stringi package to ensure the results are consistent.
Installation
You can install the strs package directly from GitHub.
# Install devtools if you haven't already
install.packages("devtools")
# Install strs package from GitHub
devtools::install_github("pythonicr/strs")
# Using pacman
pacman::p_load_gh("pythonicr/strs")Getting Started
Basic Usage
Here are some examples demonstrating how to use the functions provided by the strs package.
Capitalize the First Character of Each Sentence
The strs_capitalize function capitalizes the first character of each string in a character vector.
library(strs)
# Capitalize the first character of each sentence
capitalized <- strs_capitalize("hello world")
print(capitalized)
#> [1] "Hello world"Perform Case Folding on Strings
The strs_casefold function performs case folding on each element of a character vector, useful for case-insensitive matching.
# Perform case folding
folded <- strs_casefold("HELLO World")
print(folded)
#> [1] "hello world"Center a String in a Field of a Given Width
The strs_center function centers each element of a character vector in a field of a specified width, padding with a specified character.
# Center a string with padding
centered <- strs_center("hello", 10)
print(centered)
#> [1] " hello "Check if String Contains a Substring
The strs_contains function checks whether each element of a character vector contains a specified substring.
# Check if strings contain a substring
contains <- strs_contains("hello world", "world")
print(contains)
#> [1] TRUECount Occurrences of a Substring in a String
The strs_count function counts the number of times a specified substring occurs in each element of a character vector.
# Count occurrences of a substring
count <- strs_count("hello world", "o")
print(count)
#> [1] 2Check if String Ends With a Specified Suffix
The strs_endswith function determines whether each element of a character vector ends with a specified suffix.
# Check if strings end with a suffix
endswith <- strs_endswith("hello world", "world")
print(endswith)
#> [1] TRUEExpand Tabs in a String to Spaces
The strs_expandtabs function replaces each tab character (\t) in a string with a specified number of spaces.
# Expand tabs to spaces
expanded <- strs_expandtabs("hello\tworld", 4)
print(expanded)
#> [1] "hello world"Find the First Occurrence of a Substring in a String
The strs_find function locates the first occurrence of a specified substring within each element of a character vector.
Check if String is Alphanumeric
The strs_isalnum function checks whether each element of a character vector is alphanumeric.
# Check if strings are alphanumeric
isalnum <- strs_isalnum("hello123")
print(isalnum)
#> [1] TRUECheck if String Contains Only Alphabetical Characters
The strs_isalpha function checks whether each element of a character vector contains only alphabetical characters.
# Check if strings are alphabetical
isalpha <- strs_isalpha("hello")
print(isalpha)
#> [1] TRUECheck if String Contains Only ASCII Characters
The strs_isascii function determines whether each element of a character vector contains only ASCII characters.
# Check if strings are ASCII
isascii <- strs_isascii("hello")
print(isascii)
#> [1] TRUECheck if String Contains Only Decimal Characters
The strs_isdecimal function checks whether each element of a character vector contains only decimal characters.
# Check if strings are decimal
isdecimal <- strs_isdecimal("12345")
print(isdecimal)
#> [1] TRUECheck if String Contains Only Digits
The strs_isdigit function checks whether each element of a character vector contains only digits.
# Check if strings are digits
isdigit <- strs_isdigit("12345")
print(isdigit)
#> [1] TRUECheck if String is in Lowercase
The strs_islower function checks whether each element of a character vector is in lowercase.
# Check if strings are lowercase
islower <- strs_islower("hello")
print(islower)
#> [1] TRUECheck if String Contains Only Numeric Characters
The strs_isnumeric function checks whether each element of a character vector contains only numeric characters.
# Check if strings are numeric
isnumeric <- strs_isnumeric("12345")
print(isnumeric)
#> [1] TRUECheck if String Contains Only Whitespace Characters
The strs_isspace function checks whether each element of a character vector contains only whitespace characters.
# Check if strings are whitespace
isspace <- strs_isspace(" ")
print(isspace)
#> [1] TRUECheck if String is in Title Case
The strs_istitle function checks whether each element of a character vector is title case.
# Check if strings are title case
istitle <- strs_istitle("This Is Title Case")
print(istitle)
#> [1] TRUECheck if String is in Uppercase
The strs_isupper function checks whether each element of a character vector is in uppercase.
# Check if strings are uppercase
isupper <- strs_isupper("HELLO")
print(isupper)
#> [1] TRUEJoin Elements into a Single String with a Separator
The strs_join function concatenates elements of an iterable using a separator.
Left-justify String in a Field of a Given Width
The strs_ljust function left-justifies each element of a character vector in a field of a specified width.
# Left-justify a string
ljust <- strs_ljust("hello", 10)
print(ljust)
#> [1] " hello"Convert String to Lowercase
The strs_lower function converts each element of a character vector to lowercase, based on the specified locale.
# Convert strings to lowercase
lower <- strs_lower("HELLO WORLD")
print(lower)
#> [1] "hello world"Left Strip Characters from a String
The strs_lstrip function removes leading characters (spaces by default) from each element of a character vector.
# Left-strip characters
lstrip <- strs_lstrip(" hello world")
print(lstrip)
#> [1] "hello world"Normalize Whitespace in a String
The strs_normalize_whitespace function normalizes the whitespace in each element of a character vector.
# Normalize whitespace
normalized <- strs_normalize_whitespace(" hello world ")
print(normalized)
#> [1] "hello world"Remove a Prefix from a String
The strs_removeprefix function removes a specified prefix from the start of each element of a character vector.
# Remove a prefix
removed_prefix <- strs_removeprefix("testString", "test")
print(removed_prefix)
#> [1] "String"Remove a Suffix from a String
The strs_removesuffix function removes a specified suffix from the end of each element of a character vector.
# Remove a suffix
removed_suffix <- strs_removesuffix("StringTest", "Test")
print(removed_suffix)
#> [1] "String"Replace Substring in a String
The strs_replace function replaces all occurrences of a specified substring in each element of a character vector.
# Replace a substring
replaced <- strs_replace("hello world", "world", "there")
print(replaced)
#> [1] "hello there"Find the Last Occurrence of a Substring in a String
The strs_rfind function locates the last occurrence of a specified substring within each element of a character vector.
# Find the last occurrence of a substring
last_occurrence <- strs_rfind("hello world", "o")
print(last_occurrence)
#> [1] 8
# 8Right-justify String in a Field of a Given Width
The strs_rjust function right-justifies each element of a character vector in a field of a specified width.
# Right-justify a string
rjust <- strs_rjust("hello", 10)
print(rjust)
#> [1] "hello "Right Strip Characters from a String
The strs_rstrip function removes trailing characters (spaces by default) from each element of a character vector.
# Right-strip characters
rstrip <- strs_rstrip("hello world ")
print(rstrip)
#> [1] "hello world"Slice Substrings from a String
The strs_slice function extracts substrings from each element of a character vector, specified by start and stop positions.
# Slice substrings
sliced <- strs_slice("hello world", 1, 5)
print(sliced)
#> [1] "hello"Split String into Substrings
The strs_split function splits each element of a character vector into substrings based on a separator.
# Split strings into substrings
split <- strs_split("hello world", " ")
print(split) # list("hello", "world")
#> [[1]]
#> [1] "hello" "world"Split String into Lines
The strs_splitlines function splits each element of a character vector into separate lines.
# Split strings into lines
split_lines <- strs_splitlines("hello\nworld\n")
print(split_lines) # list("hello", "world")
#> [[1]]
#> [1] "hello" "world"Check if String Starts With a Specified Prefix
The strs_startswith function determines whether each element of a character vector starts with a specified prefix.
# Check if strings start with a prefix
startswith <- strs_startswith("hello world", "hello")
print(startswith)
#> [1] TRUEStrip Characters from Both Ends of a String
The strs_strip function removes leading and trailing characters (spaces by default) from each element of a character vector.
# Strip characters from both ends
strip <- strs_strip(" hello world ")
print(strip)
#> [1] "hello world"Convert String to Title Case
The strs_title function converts each element of a character vector to title case, based on the specified locale.
# Convert strings to title case
title <- strs_title("hello world")
print(title)
#> [1] "Hello World"Convert String to Uppercase
The strs_upper function converts each element of a character vector to uppercase, based on the specified locale.
# Convert strings to uppercase
upper <- strs_upper("hello world")
print(upper)
#> [1] "HELLO WORLD"