JavaScript 和正则表达式：如何检查字符串是否仅为 ASCII？
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JavaScript & regex : How do I check if the string is ASCII only?
提问by Raptor
I know I can validate against string with words ( 0-9 A-Z a-z and underscore ) by applying Win regex like this:
我知道我可以通过W在正则表达式中应用这样的单词（0-9 AZ az 和下划线）来验证字符串：
function isValid(str) { return /^\w+$/.test(str); }
But how do I check whether the string contains ASCII characters only? ( I think I'm close, but what did I miss? )
但是如何检查字符串是否仅包含 ASCII 字符？（我想我已经接近了，但我错过了什么？）
Reference: https://stackoverflow.com/a/8253200/188331
参考：https: //stackoverflow.com/a/8253200/188331
UPDATE: Standard character set is enough for my case.
更新：标准字符集对我来说就足够了。
回答by zzzzBov
All you need to do it test that the characters are in the right character range.
您只需要测试字符是否在正确的字符范围内即可。
function isASCII(str) {
return /^[\x00-\x7F]*$/.test(str);
}
Or if you want to possibly use the extended ASCII character set:
或者，如果您想使用扩展的 ASCII 字符集：
function isASCII(str, extended) {
return (extended ? /^[\x00-\xFF]*$/ : /^[\x00-\x7F]*$/).test(str);
}
回答by Danilo Valente
You don't need a RegEx to do it, just check if all characters in that string have a char code between 0 and 127:
您不需要 RegEx 来执行此操作，只需检查该字符串中的所有字符是否都具有介于 0 和 127 之间的字符代码：
function isValid(str){
if(typeof(str)!=='string'){
return false;
}
for(var i=0;i<str.length;i++){
if(str.charCodeAt(i)>127){
return false;
}
}
return true;
}
回答by Kevin Yue
For ES2018, Regexp support Unicode property escapes, you can use /[\p{ASCII}]+/uto match the ASCII characters. It's much clear now.
对于 ES2018，Regexp 支持Unicode 属性转义，可以/[\p{ASCII}]+/u用来匹配 ASCII 字符。现在已经很清楚了。
Supported browsers:
支持的浏览器：
- Chrome 64+
- Safari/JavaScriptCore beginning in Safari Technology Preview 42
- 铬 64+
- 从 Safari Technology Preview 42 开始的 Safari/JavaScriptCore
回答by StarPlayrX
var check = function(checkString) {
var invalidCharsFound = false;
for (var i = 0; i < checkString.length; i++) {
var charValue = checkString.charCodeAt(i);
/**
* do not accept characters over 127
**/
if (charValue > 127) {
invalidCharsFound = true;
break;
}
}
return invalidCharsFound;
};
