regExp.toString
toString()返回一个表示该正则表达式的字符串。
语法
regexObj.toString();返回值
代表给定对象的字符串。
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
使用toString()
下例输出?RegExp对象的字符串值：
var myExp = new RegExp('a+b+c');
console.log(myExp.toString()); // logs '/a+b+c/'
var foo = new RegExp('bar', 'g');
console.log(foo.toString()); // logs '/bar/g'清空正则表达式并转义
从ECMAScript 5开始，一个空的正则表达式返回字符串“/（？：）/”和行结束符如“\ n”被转义：
new RegExp().toString(); // "/(?:)/"
new RegExp('\n').toString() === '/\n/'; // true, prior to ES5
new RegExp('\n').toString() === '/\\n/'; // true, starting with ES5规范
Specification | Status | Comment |
|---|---|---|
ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.1. |
ECMAScript 5.1 (ECMA-262)The definition of 'RegExp.prototype.toString' in that specification. | Standard | Added definition for escaping behavior and "(?:)" for empty regular expressions. |
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'RegExp.prototype.toString' in that specification. | Standard | ? |
ECMAScript Latest Draft (ECMA-262)The definition of 'RegExp.prototype.toString' in that specification. | Draft | ? |
浏览器兼容性
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Escaping | (Yes) | ? | 38 (38) | (Yes) | (Yes) | (Yes) |
Generic function | ? | ? | 39 (39) | ? | ? | ? |
Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Escaping | (Yes) | (Yes) | ? | 38.0 (38) | (Yes) | (Yes) | (Yes) |
Generic function | ? | ? | ? | 39.0 (39) | ? | ? | ? |
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