在jscript regexp字符类中转发斜杠？ [英] Escape forward slash in jscript regexp character class?

问题描述

我有正式表达式测试数字（ 0-9 ）和/或转斜线（ / ） 。看起来像这样：

I have a regular expression testing for numbers(0-9) and/or forward slashes (/). It looks like this:

/^[0-9/]+$/i.test(value)

现在我相信这是正确的，但eclipse JavaScript验证器不同意：

Now I believe this to be correct, but the eclipse javascript validator disagrees:

令牌]上的语法错误，删除此令牌

Syntax error on token "]", delete this token

我想这是因为分隔符/分隔符是 / ，而eclipse'认为'正则表达式已经完成（因此一个] 将是意外的）。

I suppose this is because the separator/delimiter is / and eclipse 'thinks' the regex is finished (and therefore a ] would be unexpected).

我们可以通过转义 / 来满足eclipse：

We can satisfy eclipse by escaping the / like so:

/^[0-9\/]+$/i.test(value)

请注意，两个版本都适用于我。

Note that both versions work for me.

我的问题是：

• 据我所知，我不要需要在该范围内专门转义正斜杠。这可能是具体的情况（对于javascript，是使用的分隔符）。


• 虽然它们似乎都工作，但我宁愿使用正确的版本，因为行为在不同的环境中，以及..因为正确和全部：）

• As far as I know I do not need to escape the forward slash specifically in that range. It might be situation specific (as in, for javascript it is the used delimiter).
• Although they both appear to be working, I'd rather use the 'correct' version because of behaviour in different environments, and, well.. because correct and all :)

有谁知道我应该做什么？ 逃避与否？我没有找到任何有信誉的网站，告诉我逃避一个范围内的 / ，但Eclipse验证器可能不是完全愚蠢的...

Does anyone know what I'm supposed to do? Escape or not? I did not find any reputable site that told me to escape the / in a range, but the Eclipse-validator is probably not completely stupid...

推荐答案

该标准清楚地表明，您可以将任何未转义的字符类除外 \ ，] 和换行符：

The standard clearly says you can put anything unescaped in a character class except \, ] and newline:

RegularExpressionClassChar ::
   RegularExpressionNonTerminator but not ] or \
   RegularExpressionBackslashSequence

RegularExpressionNonTerminator ::
    SourceCharacter but not LineTerminator

（ http：// es5 .github.com /＃x7.8.5 ）。不需要逃避 / 。

另一方面，我个人会毫不怀疑地逃避一切，只是为了使不太聪明的解析器快乐。

On the other side, I personally would escape everything when in doubt, just to make less smart parsers happy.

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