如何使用 # 作为 CoffeeScript heregex 的一部分? [英] How to use # as part of CoffeeScript heregex?

问题描述

我正在尝试匹配 jQuery Mobile URL 的哈希片段，如下所示:

I'm trying to match the hash fragment of a jQuery Mobile URL like this:

    matches = window.location.hash.match ///
        #                   # we're interested in the hash fragment
        (?:.*/)?            # the path; the full page path might be /dir/dir/map.html, /map.html or map.html
                            # note the path is not captured
        (w+.html)$        # the name at the end of the string
        ///

但是，问题在于 # 符号从编译的 JS 文件中的正则表达式中被删除，因为它被视为注释的开头.我知道我可以切换到普通的正则表达式，但是有什么方法可以在 heregex 中使用 # 吗?

However, the problem is that the # symbol gets chopped from the regex in the compiled JS file because it's treated as the start of a comment. I know I could switch to a normal regex, but is there any way to use # in a heregex?

推荐答案

以通常的方式转义:

matches = window.location.hash.match ///
    #                  # we're interested in the hash fragment
    (?:.*/)?            # the path; the full page path might be /dir/dir/map.html, /map.html or map.html
                        # note the path is not captured
    (w+.html)$        # the name at the end of the string
    ///

这将编译成这个正则表达式:

That will compile to this regex:

/#(?:.*/)?(w+.html)$/

并且 # 与 JavaScript 正则表达式中的 # 相同.

And # is the same as # in a JavaScript regex.

您也可以使用 Unicode 转义 u0023:

You could also use the Unicode escape u0023:

matches = window.location.hash.match ///
    u0023              # we're interested in the hash fragment
    (?:.*/)?            # the path; the full page path might be /dir/dir/map.html, /map.html or map.html
                        # note the path is not captured
    (w+.html)$        # the name at the end of the string
    ///

但没有多少人会将 u0023 识别为哈希符号，因此 # 可能是更好的选择.

But not many people are going to recognize u0023 as a hash symbol so # is probably a better choice.

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