![]() ![]() The RegExp.test() method is not recommended for beginners who have not yet learned about Regex. If you’re performing a simple search and have no need for advanced string functions, using includes() or indexOf() may be a better approach. The more statements you add to your regex rules, the longer your search will take. The downside to regex is that it can be slower to run depending on what rules you use. This is because “JavaScript” is in our “example” string. ![]() If the specified string does not contain the characters for which you are looking, includes() will return “false.” ![]() If the string contains certain characters, the method will return “true.” The JavaScript includes() method, introduced in ES6, determines whether a string contains the characters you have passed into the method. ![]() In this tutorial, we’re going to discuss methods you can use to check if a JavaScript string contains another string using these three approaches. There are three methods for checking if a JavaScript string contains another character or sequence of characters: Access exclusive scholarships and prep coursesīy continuing you agree to our Terms of Service and Privacy Policy, and you consent to receive offers and opportunities from Career Karma by telephone, text message, and email.Career Karma matches you with top tech bootcamps.log ( isASubstring ( "JavaScript", "Java" ) ) // true console. function isASubstring ( largerString, smallerString ) console. However, Internet Explorer and some other old browsersĭo not support the includes() method. Includes() method was introduced in ES6, since then it is a widely used string method. I am going to discuss two built-in methods of JavaScript string, which helps us in determining whether a string is a substring of another string or not. In this tutorial, you will learn how you can check whether a substring is included in a string or not. ![]()
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