The easiest and most compatible method to find a substring within a string in Javascript is to use the match() function with a regular expression. Here are several methods that should work for you. 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.There are several methods to check if a substring is contained within a string in Javascript. 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.
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