JavaScript参考手册
RegExp
regExp.source
source属性返回一个值为当前正则表达式对象的模式文本的字符串，该字符串不会包含正则字面量两边的斜杠以及任何的标志字符。
| RegExp.prototype.source属性的属性特性 |
|:----|
| Writable | no |
| Enumerable | no |
| Configurable | yes |
示例
使用source
var regex = /fooBar/ig;
console.log(regex.source); // "fooBar", doesn't contain /.../ and "ig".清空正则表达式并转义
从ECMAScript 5开始，该source属性不再为空的正则表达式返回一个空字符串。而是"(?:)"返回字符串。另外，行终止符（例如“\ n”）现在被转义了。
new RegExp().source; // "(?:)"
new RegExp('\n').source === '\n'; // true, prior to ES5
new RegExp('\n').source === '\\n'; // true, starting with ES5规范
Specification |
Status |
Comment |
|---|---|---|
ECMAScript 3rd Edition (ECMA-262) |
Standard |
Initial definition. Implemented in JavaScript 1.2. JavaScript 1.5: source is a property of a RegExp instance, not the RegExp object. |
ECMAScript 5.1 (ECMA-262)The definition of 'RegExp.prototype.source' in that specification. |
Standard |
The source property for empty regular expressions now returns "(?:)" instead of an empty string. A definition for the escaping behavior has been added. |
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'RegExp.prototype.source' in that specification. |
Standard |
source is now a prototype accessor property rather than an instance's own data property. |
ECMAScript Latest Draft (ECMA-262)The definition of 'RegExp.prototype.source' 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) |
"(?:)" for empty regexps |
No support |
? |
38 (38) |
? |
? |
(Yes) |
Escaping |
? |
? |
38 (38) |
? |
? |
? |
Prototype accessor property |
? |
? |
41 (41) |
? |
? |
? |
Feature |
Android |
Chrome for Android |
Edge |
Firefox Mobile (Gecko) |
IE Mobile |
Opera Mobile |
Safari Mobile |
|---|---|---|---|---|---|---|---|
Basic support |
(Yes) |
(Yes) |
(Yes) |
(Yes) |
(Yes) |
(Yes) |
(Yes) |
"(?:)" for empty regexps |
? |
? |
? |
38.0 (38) |
? |
? |
? |
Escaping |
? |
? |
? |
38.0 (38) |
? |
? |
? |
Prototype accessor property |
? |
? |
? |
41.0 (41) |
? |
? |
? |
RegExp相关
JavaScript 是一种高级编程语言，通过解释执行，是一门动态类型，面向对象（基于原型）的解释型语言。它已经由ECMA（欧洲电脑制造商协会）通过 ECMAScript 实现语言的标准化。它被世界上的绝大多数网站所使用，也被世界主流浏览器（ Chrome、IE、FireFox、Safari、Opera ）支持。JavaScript 是一门基于原型、函数先行的语言，是一门多范式的语言，它支持面向对象编程，命令式编程，以及函数式编程。它提供语法来操控文本、数组、日期以及正则表达式等，不支持 I/O，比如网络
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