# Locate position of patterns in a character string in R

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Locate position of patterns in a character string in R, we will learn how to use the `str_locate`

and `str_locate_all`

functions in R to locate the position of patterns in a character string.

These functions are part of the `stringr`

package, which is a part of the tidyverse.

**Example Data**

Before we start, we need to create an example character string in R:

x <- c("my example string")

We also need to install and load the `stringr`

package:

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install.packages("stringr") library("stringr")

**Example 1: Application of str_locate Function in R**

In this example, we will use the `str_locate`

function to locate the position of a pattern in our character string:

str_locate(x, "mple") # start end # [1,] 7 10

As you can see, the `str_locate`

function returns a matrix containing a starting and an ending value. In this case, the pattern “mple” begins at the 7th character and ends at the 10th character of our string.

**Example 2: Application of str_locate_all Function in R**

In this example, we will use the `str_locate_all`

function to locate all occurrences of a pattern in our character string:

str_locate_all(x, "m") # [[1]] # start end # [1,] 1 1 # [2,] 7 7

As you can see, the `str_locate_all`

function returns a list of matrices, where each matrix contains the starting and ending values of an occurrence of the pattern.

In this case, the letter “m” occurs at the first and at the 7th position of our character string.

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**Example 3: Locating Multiple Patterns**

In this example, we will use both `str_locate`

and `str_locate_all`

functions to locate multiple patterns in our character string:

str_locate(x, "e") # start end # [1,] 4 4 # [2,] 8 8 str_locate_all(x, "l") # [[1]] # start end # [1,] 5 5 # [2,] 9 9

As you can see, the `str_locate`

function returns a matrix containing the starting and ending values of each occurrence of the pattern.

The `str_locate_all`

function returns a list of matrices, where each matrix contains the starting and ending values of each occurrence of the pattern.

**Conclusion**

In this tutorial, we learned how to use the `str_locate`

and `str_locate_all`

functions in R to locate the position of patterns in a character string.

These functions are useful for extracting specific information from text data and can be used in a variety of applications.

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