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R Strings


String Literals

Strings are used for storing text.

A string is surrounded by either single quotation marks, or double quotation marks:

"hello" is the same as 'hello':

Example

"hello"
'hello'
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Assign a String to a Variable

Assigning a string to a variable is done with the variable followed by the <- operator and the string:

Example

str <- "Hello"
str # print the value of str
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Multiline Strings

You can assign a multiline string to a variable like this:

Example

str <- "Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua."

str # print the value of str
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However, note that R will add a "\n" at the end of each line break. This is called an escape character, and the n character indicates a new line.

If you want the line breaks to be inserted at the same position as in the code, use the cat() function:

Example

str <- "Lorem ipsum dolor sit amet,
consectetur adipiscing elit,
sed do eiusmod tempor incididunt
ut labore et dolore magna aliqua."

cat(str)
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String Length

There are many usesful string functions in R.

For example, to find the number of characters in a string, use the nchar() function:

Example

str <- "Hello World!"

nchar(str)
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Check a String

Use the grepl() function to check if a character or a sequence of characters are present in a string:

Example

str <- "Hello World!"

grepl("H", str)
grepl("Hello", str)
grepl("X", str)
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Combine Two Strings

Use the paste() function to merge/concatenate two strings:

Example

str1 <- "Hello"
str2 <- "World"

paste(str1, str2)
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