将基于学位的地理坐标与正则表达式匹配 [英] Matching degree-based geographical coordinates with a regular expression

问题描述

我希望能够识别出以下形式的模式

I'd like to be able to identify patterns of the form

28°44'30"N., 33°12'36"E.

这是我到目前为止的内容：

Here's what I have so far:

use utf8;
qr{
    (?:
    \d{1,3} \s*  °   \s*
    \d{1,2} \s*  '   \s*
    \d{1,2} \s*  "   \s*
    [ENSW]  \s* \.?
            \s*  ,?  \s*
    ){2}
}x;

不需要也就是说，这不匹配。这与扩展字符（即度数符号）有关系吗？还是我只是把这段时间搞砸了？

Needless to say, this doesn't match. Does it have anything to do with the extended characters (namely the degree symbol)? Or am I just screwing this up big time?

如果您知道可以解决我的问题的信息，我也希望能找到 CPAN 的路线。我看过 Regex :: Common 和 Geo :: Formatter ，但是这些都不是我想要的。有什么主意吗？

I'd also appreciate directions to CPAN, if you know of something there that will solve my problem. I've looked at Regex::Common and Geo::Formatter, but none of these do what I want. Any ideas?

更新

事实证明，我需要使用utf8取出 从文件中读取坐标时。我用坐标手动初始化了一个变量，它可以很好地匹配，但是一旦我从文件中读取同一行，它就不会匹配。取出使用utf8 解决了这个问题。我想我不太了解 utf8 在做什么。

It turns out that I needed to take out use utf8 when reading the coordinates from a file. If I manually initialize a variable with a coordinate, it would match fine, but as soon as I read that same line from a file, it wouldn't match. Taking out use utf8 solved that. I guess I don't really understand what utf8 is doing.

推荐答案

尝试删除 use utf8 语句。

度数符号对应于我当前编码中的字符值0xB0（无论如何）也就是说，但它不是UTF8）。 0xB0是UTF8中的连续字节；期望序列的第二个，第三个或第四个字符以0xC2和0xF4之间的某个字符开头。在 utf8 中使用该字符串会给您带来错误。

The degree symbol corresponds to character value 0xB0 in my current encoding (whatever that is, but it ain't UTF8). 0xB0 is a "continuation byte" in UTF8; it is expected to by the second, third, or fourth character of a sequence that begins with something between 0xC2 and 0xF4. Using that string with utf8 will give you an error.

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