If the substring or word is not found, it returns -1. This method returns the index of the first occurrence of the specified substring inside the calling String object. The fastest way to check if a string contains a particular word or substring is with the help of String.indexOf() method. Using String.indexOf() to Check if String Contains Substring

Using String.match() to Check if String Contains Substring.

Using arch() to Check if String Contains Substring.

Using String.includes() to Check if String Contains Substring.

Using String.indexOf() to Check if String Contains Substring.

Output: Substring exists! MCQ Practice competitive and technical Multiple Choice Questions and Answers (MCQs) with simple and logical explanations to prepare for tests and interviews. Like the indexOf() method, the search() method also returns the index of the first match, and returns -1 if no match was found. How to check if a string contains a substring in JavaScript using search():Īlso you can use the search() method to search for a particular text or pattern (using a regular expression) within a string. Here is an example: // Example of a string

This method returns true or false instead of the index. In ES6, you can use the includes() method to check whether a string contains a substring or not. Output: Substring exists! How to check if a string contains a substring in JavaScript using includes(): Checks if the substring exists in the string Var str = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.' How to check if a string contains a substring in JavaScript using indexOf(): // Example of a string

This method returns the index or position of the first occurrence of the substring, otherwise, it returns -1 if no match is found. The easiest and fastest way to check if a string contains a substring or not in JavaScript is to use the indexOf() method.

Javascript string contains substring