## 概述

`toString()` 返回一个表示该正则表达式的字符串。

## 语法

    regexObj.toString()

### 参数

无

## 描述

`RegExp` 对象覆盖了 `Object` 对象的 `toString()` 方法，并没有继承 `Object.prototype.toString()`。对于 `RegExp` 对象，`toString` 方法返回一个该正则表达式的字符串形式。

## 示例

### 例子：使用 `toString`

下例输出 `RegExp` 对象的字符串值：

    myExp = new RegExp("a+b+c");
    alert(myExp.toString());       // 显示 "/a+b+c/"

    foo = new RegExp("bar", "g");
    alert(foo.toString());         // 显示 "/bar/g"

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 3rd Edition. Implemented in JavaScript 1.1 | Standard | Initial definition.
ECMAScript 5.1 (ECMA-262) RegExp.prototype.toString | Standard |
ECMAScript 2015 (6th Edition, ECMA-262) RegExp.prototype.toString | Standard |

## 浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

- Desktop
- Mobile

Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari
--- | --- | --- | --- | --- | ---
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

## 相关链接

- `Object.prototype.toString()`