JavaScript是否支持正则表达式中超出0xFFFF的Unicode范围？

This example regular expression (^[\u0021-\u003F\u0041-\uFFEF]+@[\u0021-\u003F\u0041-\uFFEF]+\.[\u0021-\u003F\u0041-\uFFEF]+$) can filter characters by their Unicode character ranges, and I can make ranges go from \u0000 to \uFFFF, but Unicode supports characters beyond 0xFFFF. Can I use ranges above these in JavaScript's regular expressions?

此示例正则表达式(^ [\ u0021- \ u003F \ u0041- \ uFFEF] + @ [\ u0021- \ u003F \ u0041- \ uFFEF] + \。[\ u0021- \ u003F \ u0041- \ uFFEF] + $)可以按Unicode字符范围过滤字符,我可以使范围从\ u0000到\ uFFFF,但Unicode支持超过0xFFFF的字符。我可以在JavaScript的正则表达式中使用上面的范围吗?

2 个解决方案

#1

For backwards compatibility with ECMAScript 5 and older environments, the unfortunate solution is to use surrogate pairs:

为了向后兼容ECMAScript 5和旧环境,不幸的解决方案是使用代理对:

>> '\uD83D\uDCA9'  
'????' // U+1F4A9 PILE OF POO  

In that case, each escape represents the code point of a surrogate half. Two surrogate halves form a single astral symbol.

在这种情况下,每个转义代表代理一半的代码点。两个代理半部形成一个单一的星体符号。

Link: https://mathiasbynens.be/notes/javascript-unicode

#2

ECMAScript6 introduces the RegExp u flag to support Unicode escapes of higher values:

ECMAScript6引入了RegExp u标志以支持更高值的Unicode转义:

(/\u{1F4A9}/u).test("????"); // true

Unfortunately, as of now only MS Edge supports this.

不幸的是,截至目前只有MS Edge支持此功能。

References

• MDN entry for RegExp.prototype.unicode

RegExp.prototype.unicode的MDN条目

• RegExp.prototype.unicode in the ES6 spec

ES6规范中的RegExp.prototype.unicode