# Split Character String into Letters & Numbers in R (2 Examples)

This tutorial shows how to divide a character string into letters and numbers in R.

The content of the article is structured like this:

Letâ€™s get started.

## Creation of Example Data

The following data is used as a basis for this R programming tutorial:

```x <- "123asdf45gh6"                                 # Create example character string
x                                                   # Print example character string
# [1] "123asdf45gh6"```

As you can see based on the previous output of the RStudio console, our example data is a single character string that contains different letters and numbers.

## Example 1: Extract Letters from Character String

In this example, Iâ€™ll demonstrate how to remove all numbers from a character string.

For this task, we can apply the gsub function as shown in the following R code:

```x_letters <- gsub("[[:digit:]]", "", x)             # Extract letters from character string
x_letters                                           # Print letters
# [1] "asdfgh"```

The previous output shows that we have kept only non-numeric values in our data.

We might also split this output into a vector containing only one letter in each vector element by using the strsplit and unlist functions:

```x_letters_split <- unlist(strsplit(x_letters, ""))  # Split characters into vector
x_letters_split                                     # Print vector
# [1] "a" "s" "d" "f" "g" "h"```

## Example 2: Extract Numbers from Character String

Example 2 illustrates how to drop all letters from a character string.

Once again, we can use the gsub function for this task:

```x_numbers <- gsub("[^0-9.-]", "", x)                # Extract numbers from character string
x_numbers                                           # Print numbers
# [1] "123456"```

Similar to Example 1, we can use the strsplit and unlist functions to split our number into digits:

```x_numbers_split <- unlist(strsplit(x_numbers, ""))  # Split characters into vector
x_numbers_split                                     # Print character vector
# [1] "1" "2" "3" "4" "5" "6"```

Furthermore, we might convert the data class of our numbers from character to numeric using the as.numeric function:

```x_numbers_split_num <- as.numeric(x_numbers_split)  # Convert character to numeric
x_numbers_split_num                                 # Print numeric vector
# [1] 1 2 3 4 5 6```

## Video & Further Resources

If you need more explanations on the R programming syntax of this article, you may have a look at the following video which I have published on my YouTube channel. In the video, I illustrate the R programming code of this post.

Furthermore, you might read the other tutorials on this website. A selection of tutorials is shown below:

Summary: In this R programming tutorial, you have learned how to split an alphanumeric character string into letters and numbers. In case you have additional questions, donâ€™t hesitate to tell me about it in the comments section.

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