Symbol.search
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The Symbol.search static data property represents the well-known symbol Symbol.search. The String.prototype.search() method looks up this symbol on its first argument for the method that returns the index within a string that matches the current object.
For more information, see RegExp.prototype[Symbol.search]() and String.prototype.search().
Try it
class Search1 { constructor(value) { this.value = value; } [Symbol.search](string) { return string.indexOf(this.value); } } console.log("foobar".search(new Search1("bar"))); // Expected output: 3 Value
The well-known symbol Symbol.search.
Property attributes of Symbol.search | |
|---|---|
| Writable | no |
| Enumerable | no |
| Configurable | no |
Examples
Custom string search
js
class CaseInsensitiveSearch { constructor(value) { this.value = value.toLowerCase(); } [Symbol.search](string) { return string.toLowerCase().indexOf(this.value); } } console.log("foobar".search(new CaseInsensitiveSearch("BaR"))); // 3 Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-symbol.search |