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

我尝试匹配jQuery Mobile URL的散列片段，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，问题是＃符号从编译的JS文件中的正则表达式中剪切，因为它被视为注释的开始。

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

转义到正确的正则表达式通常的方式：

Escape it in the usual fashion:

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
    ///

这将编译为正则表达式：

That will compile to this regex:

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

并且 \＃

您也可以使用Unicode转义 \\\# / code>：

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
    ///

但是没有多少人会去识别 \\\# 作为散列符号，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.

这篇关于如何使用＃作为CoffeeScript heregex的一部分？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！