如何使用#作为CoffeeScript heregex的一部分？

Question

我正在尝试匹配jQuery Mobile URL的哈希片段,如下所示:

    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#符号会从编译的JS文件中的正则表达式中删除,因为它被视为注释的开头.我知道我可以切换到正常的正则表达式,但有没有办法在heregex中使用#？

Answer 1

以通常的方式逃脱它:

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
    ///

这将编译到这个正则表达式:

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

和JavaScript正则表达式\#相同#.

您还可以使用Unicode转义\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
    ///

但是没有多少人会认为\u0023是哈希符号所以\#可能是更好的选择.