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24 lis 2009 · In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: var string = "foo"; var substring = "oo"; console.log (string.indexOf (substring) !== -1); // true. edited Oct 18, 2022 at 6:47.
To check for a substring, the following approach can be taken: if (mainString.toLowerCase().includes(substringToCheck.toLowerCase())) { // mainString contains substringToCheck } Check out the documentation to know more.
The includes() method returns true if a string contains a specified string. Otherwise it returns false. The includes() method is case sensitive.
7 paź 2022 · In this article, you will learn two different ways you can check if a string contains a substring using JavaScript methods. Specifically, you will learn: How to use the built-in includes() JavaScript method. How to use the built-in indexOf() JavaScript method. Here is what we will cover in more detail:
16 maj 2019 · There's two common ways to check whether a string contains a substring in JavaScript. The more modern way is the String#includes () function. const str = 'Arya Stark'; str.includes ('Stark'); // true str.includes ('Snow'); // false. You can use String#includes () in all modern browsers except Internet Explorer.
24 kwi 2019 · There are multiple ways to check if a string contains a substring in JavaScript. You can use either String.includes(), String.indexOf(), String.search(), String.match(), regular expressions, or 3rd-party library like Lodash.
1 mar 2024 · Use the `String.includes()` method to check if a string contains a substring, e.g. `myString.includes('substring')`.
