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I was curious about:
> strsplit("ty,rr", split = ",")
[[1]]
[1] "ty" "rr"
> strsplit("ty|rr", split = "|")
[[1]]
[1] "t" "y" "|" "r" "r"
Why don't I get c("ty","rr") from strsplit("ty|rr", split="|")?
363
The vertical bar ( | ) -- also called the vertical line, vertical slash, pipe, pipe symbol or upright slash -- is a symbol used in mathematics, computing and other areas to represent a specific type of logic or operation, depending on its context.
A pipe symbol is a typographical mark that resembles a vertical line ( | ). This mark is also known by many other names, such as a vertical bar or a vertical line.
How to Type the Vertical Line Character on a Keyboard. The pipe character is not hidden on a keyboard. It is located right above the Enter key. Another way to type the vertical bar character is to turn on the numeric keypad, hold ALT , then press 1, 2, and 4.
The vertical bar character (|), located over the backslash (\) key, is used as an OR operator. In the C/C++ language, two vertical bars are used; for example, if (x == 'a' || x == 'b') means "if X is equal to A or B." It is also used as a pipe symbol, which directs the output of one process to another.
It's because the split argument is interpreted as a regular expression, and | is a special character in a regex.
To get round this, you have two options:
Option 1: Escape the |, i.e. split = "\\|"
strsplit("ty|rr", split = "\\|")
[[1]]
[1] "ty" "rr"
Option 2: Specify fixed = TRUE:
strsplit("ty|rr", split = "|", fixed = TRUE)
[[1]]
[1] "ty" "rr"
Please also note the See Also section of ?strsplit, which tells you to read ?"regular expression" for details of the pattern specification.
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