Symbol.search - JavaScript 编辑

The Symbol.search well-known symbol specifies the method that returns the index within a string that matches the regular expression. This function is called by the String.prototype.search() method.

For more information, see RegExp.prototype[@@search]() and String.prototype.search().

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Property attributes of Symbol.search
Writable	no
Enumerable	no
Configurable	no

Examples

Custom string search

class caseInsensitiveSearch {
  constructor(value) {
    this.value = value.toLowerCase();
  }
  [Symbol.search](string) {
    return string.toLowerCase().indexOf(this.value);
  }
}

console.log('foobar'.search(new caseInsensitiveSearch('BaR')));
// expected output: 3

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Symbol.search' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• Symbol.match
• Symbol.replace
• Symbol.split
• RegExp.prototype[@@search]()