Count the number of occurrences of the sequence of characters, red, in string arrays.

Starting in R2017a, you can create a string using double quotes.

str = "paired with red shoes"

str = 
"paired with red shoes"

To count the occurrences of red, use the count function. In this example, the result is 2 because red is also part of the word paired.

A = count(str,"red")

A = 2

Create a 2-by-1 string array.

str = ["red green red red blue blue green";
       "green red blue green green blue"]

str = 2x1 string
    "red green red red blue blue green"
    "green red blue green green blue"

Count the occurrences of red in each element of str. If str is a string array or cell array of character vectors, then A is a numeric array that has the same size.

A = count(str,"red")

A = 2×1

     3
     1

Count the total number of occurrences of red and blue in a string array.

Starting in R2017a, you can create strings using double quotes.

str = ["red green blue";
       "green red blue green blue"]

str = 2x1 string
    "red green blue"
    "green red blue green blue"

count returns 2 for the first string because red and blue each occur once. count returns 3 for the second string because red occurs once and blue occurs twice.

A = count(str,["red","blue"])

A = 2×1

     2
     3

Count the number of occurrences of the letter E in a string array that contains names, ignoring case.

Starting in R2017a, you can create strings using double quotes.

str = ["Edgar Allan Poe";"Louisa May Alcott"]

str = 2x1 string
    "Edgar Allan Poe"
    "Louisa May Alcott"

A = count(str,'E','IgnoreCase',true)

A = 2×1

     2
     0

Count the number of times al occurs in the word alphabetical.

chr = 'alphabetical'

chr = 
'alphabetical'

A = count(chr,'al')

A = 2