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How to check whether a string contains a substring in JavaScript?


ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring)); // true
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javascript check if string contains a text substring

stringVariable.includes("Your Text");
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How to Check if a Substring is in a String in JavaScript Using the includes() Method

// Here's what the syntax looks like:
// string.includes(substring, fromIndex)

// Here's an example:

const bio = "I am a web developer";
console.log(bio.includes("web"));
// true
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javascript - How do I check if string contains substring?

if (str.toLowerCase().indexOf("yes") >= 0)
Comment

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring)); // true
Comment

How to check whether a string contains a substring in JavaScript?

There is a String.prototype.includes in ES6:

"potato".includes("to")
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