在RegEx中修复JSLint错误的擒纵机构警告 [英] Fix JSLint bad escapement warning in RegEx

问题描述

我在第三方jQuery控件中有以下代码，名为 jquery.facebox.js ， JSLint 不喜欢。这是RegEx中的一个错误的擒纵错误。

I have the following code in a 3rd party jQuery control called jquery.facebox.js that JSLint doesn't like. It's a bad escapement error in a RegEx.

正则表达式对于我来说就像是Romulan，所以我看不到如何解决错误（这是与期间字符在RegEx中）：

Regular expression are like Romulan to me, so I can't see how to fix the error (which is with the period character in the RegEx):

var imageTypes = $.facebox.settings.imageTypes.join('|');
$.facebox.settings.imageTypesRegexp = new RegExp('\.(' + imageTypes + ')$', 'i');

推荐答案

添加第二个 \ 之后'\ 。这是一个字符串问题，而不是正则表达式问题： - ）

Add a second \ after '\. This is a string problem, not a regex problem :-)

要在一个字符串中有一个 \ Javascript（和许多其他语言）你需要逃脱它，因为它用于转义序列（如 \\\
）。所以要有一个 \ ，你必须把 \\ 。

To have a \ in a string in Javascript (and many other languages) you need to escape it, because it is used for escape sequences (like \n). So to have a \ you have to put \\.

在正则表达式中， \ 用于转义下一个字符，但这是另一个转义（未连接到字符串转义符）。所以它是 \\。

In regexes \ is used to escape the next character, but that is another escape (not connected to the "string" escape). So it's \\.

要更清楚：你希望你的字符串是字面上 code> \。（某些东西。为了让你需要通过放一个来逃避 \ \ （否则你的字符串将是。（，因为 \ 会逃脱，所以它不会做任何事情）如果你好奇，正则表达式中的。意味着任何字符，但是如果你想搜索一个。（一个点），你必须逃脱它，并猜测你使用什么？ \ ： - ）

To be more clear: you want your string to be "literally" \.(something. To have that you need to escape the \ by putting another \ (otherwise your string would be .( because the \ would escape the ., so it wouldn't do anything). If you are curious, the . in regexes means any character, but if you want to search for a . (a dot), you have to escape it, and guess what you use? The \ :-)

如果有一天你必须在C＃中编程，在C＃中，你可以使用 @something。@ disable转义字符串中的扩展，所以 @\是一个 \

If one day you'll have to program in C#, in C# you can solve this problem using the @"something". The @ disable escape "expansion" in a string. So @"\" is a \

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