JavaScript &正则表达式:如何检查字符串是否仅为 ASCII? [英] JavaScript & regex : How do I check if the string is ASCII only?

问题描述

我知道我可以通过像这样在正则表达式中应用 W 来验证带有单词(0-9 A-Z a-z 和下划线)的字符串:

I know I can validate against string with words ( 0-9 A-Z a-z and underscore ) by applying W in regex like this:

function isValid(str) { return /^\w+$/.test(str); }

但是如何检查字符串是否仅包含 ASCII 字符?(我想我已经接近了，但我错过了什么?)

But how do I check whether the string contains ASCII characters only? ( I think I'm close, but what did I miss? )

参考:https://stackoverflow.com/a/8253200/188331

UPDATE :标准字符集对我来说已经足够了.

UPDATE : Standard character set is enough for my case.

推荐答案

您只需要做的就是测试字符是否在正确的字符范围内.

All you need to do it test that the characters are in the right character range.

function isASCII(str) {
    return /^[\x00-\x7F]*$/.test(str);
}

或者如果您想使用扩展的 ASCII 字符集:

Or if you want to possibly use the extended ASCII character set:

function isASCII(str, extended) {
    return (extended ? /^[\x00-\xFF]*$/ : /^[\x00-\x7F]*$/).test(str);
}

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