如果正则表达式不是必须的，最好是让浏览器决定使用eval:

function isValidVarName( name ) {
    try {
        // Update, previoulsy it was
        // eval('(function() { var ' + name + '; })()');
        Function('var ' + name);
    } catch( e ) {
        return false;
    }
    return true;
}

isValidVarName('my_var');     // true
isValidVarName('1');          // false

实际上，ECMAScript在第15页上说: 标识符可以以$、下划线或UnicodeLetter开头，然后继续(就在它下面)指定UnicodeLetter可以是Unicode类别Lo、Ll、Lu、Lt、Lm和Nl中的任何字符。 当你查阅这些分类时，你会发现它提供了比拉丁字母更多的可能性。只要在谷歌中搜索“Unicode类别”，你就可以找到它们。

下面是创建变量名的一个快速建议。

如果您希望变量在Firefox中使用时不发生冲突，请不要使用变量名“_content”，因为该变量名已被浏览器使用。我发现这一点很困难，不得不在一个大型JavaScript应用程序中更改所有使用变量“_content”的地方。

据我所知，公认的答案将排除许多有效的标识符。下面是一个符合规范的正则表达式(参见7.6章关于标识符)。使用RegexBuddy创建它，您可以在http://samples.geekality.net/js-identifiers上找到解释的导出。

^[$_\p{L}][$_\p{L}\p{Mn}\p{Mc}\p{Nd}\p{Pc}\u200C\u200D]*+$

且名称不能为以下保留字。

Break, do, instanceof, typeof, case, else, new, var, catch, finally, return, void, continue, for, switch, while, debugger, function, this, with, default, if, throw, delete, in, try, class, enum, extends, super, const, export, import, implements, let, private, public, yield, interface, package, protected, static, null, true, false

基本上，以正则表达式形式:[a-zA-Z_$][0-9a-zA-Z_$]*。换句话说，第一个字符可以是字母、_或$，其他字符可以是字母、_、$或数字。

注意:虽然其他回答指出可以在JavaScript标识符中使用Unicode字符，但实际的问题是“我应该使用什么字符作为像jQuery这样的扩展库的名称?”这就是那个问题的答案。您可以在标识符中使用Unicode字符，但不要这样做。编码总是被搞砸。将公共标识符保持在32-126 ASCII范围内，这样比较安全。

引用有效的JavaScript变量名，我的文章总结了相关的规范部分:

An identifier must start with $, _, or any character in the Unicode categories “Uppercase letter (Lu)”, “Lowercase letter (Ll)”, “Titlecase letter (Lt)”, “Modifier letter (Lm)”, “Other letter (Lo)”, or “Letter number (Nl)”. The rest of the string can contain the same characters, plus any U+200C zero width non-joiner characters, U+200D zero width joiner characters, and characters in the Unicode categories “Non-spacing mark (Mn)”, “Spacing combining mark (Mc)”, “Decimal digit number (Nd)”, or “Connector punctuation (Pc)”.

我还创建了一个工具，可以告诉你输入的任何字符串是否符合ECMAScript 5.1和Unicode 6.1的有效JavaScript变量名:

注:为了让您了解Anthony Mills的回答有多错误:如果您将所有这些规则总结为JavaScript的一个ascii正则表达式，那么它将有11,236个字符长。下面就是:

// ES5.1 / Unicode 6.1
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