Check the Number of Occurrences of a Character in the String
In this example, you will learn to write a JavaScript program that checks the number of occurrences of a character in a string.
To understand this example, you should have the knowledge of the following JavaScript programming topics:
JavaScript String
JavaScript Regex
If you check the number of occurrences of 'o' in the string 'school', the result is 2.
Example 1: Check Occurrence of a Character Using for Loop
In the above example, the user is prompted to enter a string and the character to check.
In the beginning, the value of the count variable is 0.
The for loop is used to iterate over the strings.
The charAt() method returns a character at a specified index.
During each iteration, if the character at that index matches the required character to match, then the count variable is increased by 1.
Example 2: Check occurrence of a character using a Regex
In the above example, a regular expression (regex) is used to find the occurrence of a string.
const re = new RegExp(letter, 'g'); creates a regular expression.
The match() method returns an array containing all the matches. Here, str.match(re);gives ["o", "o"].
The length property gives the length of an array element.
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