RegExp.prototype.flags - JavaScript 编辑

The flags property returns a string consisting of the flags of the current regular expression object.

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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 RegExp.prototype.flags
Writable	no
Enumerable	no
Configurable	yes

Description

Flags in the flags property are sorted alphabetically (from left to right, e.g. "gimsuy").

Examples

Using flags

/foo/ig.flags;   // "gi"
/bar/myu.flags;  // "muy"

Polyfill

if (RegExp.prototype.flags === undefined) {
  Object.defineProperty(RegExp.prototype, 'flags', {
    configurable: true,
    get: function() {
      return this.toString().match(/[gimsuy]*$/)[0];
    }
  });
}

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'RegExp.prototype.flags' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• RegExp.prototype.source