R - Character type

About

A vector containing character values.

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Example

• One

> v = "My Name";
> class(v)
[1] "character"

• List

> v <- c("My Name","Is","Nico")
> class(v)
[1] "character"

Management

Counting the number of occurrence

library(stringr)
str_count("/mt/path", "/")

[1] 2

Concatenate

Concatenate vectors after converting to character.

helloWorld <- paste0("Hello", "world", sep=" ")

where:

• sep is the separator character between the arguments

Escape \ Quotes

https://stat.ethz.ch/R-manual/R-devel/library/base/html/Quotes.html

Substring

substr(x, start, stop)
substring(text, first, last = 1000000L)
substr(x, start, stop) <- value
substring(text, first, last = 1000000L) <- value

Contain

• grepl returns a logical vector (match or not for each element of the input x).

test = "[nqSError: 46066]"
grepl("46066",test)

[1] TRUE

• grep will filter the vector.