验证JavaScript函数名称

Question

什么是正则表达式,我可以用来匹配有效的JavaScript函数名称...

例如myfunction有效但my<\fun\>ction无效.

[a-zA-Z0-9_])?

Answer 1

这比你想象的要复杂得多.根据ECMAScript标准,标识符是:

an IdentifierName that is not a ReservedWord

所以首先你必须检查标识符不是以下之一:

instanceof typeof break do new var case else return void catch finally
continue for switch while this with debugger function throw default if
try delete in

未来可能会有其他一些人.

IdentifierName以以下内容开头:

a letter
the $ sign
the _ underscore

并且可以进一步包括任何这些字符加上:

a number
a combining diacritical (accent) character
various joiner punctuation and zero-width spaces

这些字符是根据Unicode字符类定义的,因此[A-Z]不完整.Ä是一封信; ?是一封信; ?是一封信.您可以使用标识符中的所有标识符,包括用于函数名称的标识符.

不幸的是,JavaScript RegExp不支持Unicode.如果你说\w你只获得ASCII字母数字.没有可行的方法来检查非ASCII标识符字符的有效性,而不是用你的脚本携带Unicode字符数据库的相关部分,这将是非常大和笨拙的.

您可以尝试简单地允许所有非ASCII字符,例如:

^[_$a-zA-Z\xA0-\uFFFF][_$a-zA-Z0-9\xA0-\uFFFF]*$

Answer 2

在目前接受的答案是不正确.bobince的答案更像是它.

要引用有效的JavaScript变量名,我的文章总结了相关的规范部分:

标识符必须以$,_或者Unicode类别中的任何字符开头"大写字母(Lu)","小写字母(Ll)","标题字母(Lt)","修饰符字母(Lm)","其他字母( Lo)",或"字母编号(Nl)".

字符串的其余部分可以包含相同的字符,加上任何U + 200C零宽度非连接字符,U + 200D零宽度连接字符和Unicode类别中的字符"非间距标记(Mn)","间距组合mark(Mc)","十进制数字编号(Nd)"或"连接符标点符号(Pc)".

链接的文章涵盖了更多的问题,但这是它的要点.

我还创建了一个工具,告诉您根据ECMAScript 5.1和Unicode 6.1输入的任何字符串是否是有效的JavaScript变量名称:

PS为了让您了解当前接受的答案有多么错误:如果您要在JavaScript的单个仅ASCII正则表达式中汇总所有这些规则,那么它将是11,236个字符长(对于ECMAScript 5.1/Unicode 6.1.0) .这里是:

// ES5.1 / Unicode 6.1
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Answer 3

[编辑]请参阅下面@ bobince的帖子,以获得更正确和彻底的答案.此答案已保留以供参考,编辑错误.

JavaScript中的有效名称必须以Unicode字母(\p{L}),美元符号或下划线开头,然后可以包含任何字符和数字,组合变音(重音)字符,以及各种连接符标点和零宽度空格.另外,它不能是由JavaScript语言的保留字(例如abstract,as,boolean,break,byte,case,等).

完整的正则表达式解决方案在普通JavaScript中会非常复杂,但XRegExp Unicode插件可以大大简化任务. 这个在线功能名称测试器也可能有用.

[ORIGINAL]这是一个不完整的正则表达式,仅使用US ASCII字母:

var fnNameRegex = /^[$A-Z_][0-9A-Z_$]*$/i;

您还必须检查它是否与任何保留字匹配(例如,抽象,布尔,中断,字节,...,while,with等).这是该列表的开始,以及一个示例函数:

var isValidFunctionName = function() {
  var validName = /^[$A-Z_][0-9A-Z_$]*$/i;
  var reserved = {
    'abstract':true,
    'boolean':true,
    // ...
    'with':true
  };
  return function(s) {
    // Ensure a valid name and not reserved.
    return validName.test(s) && !reserved[s];
  };
}();