用正负负替换Javascript RegExp [英] Javascript RegExp replace with negative lookahead

问题描述

我正在尝试使用JS替换当前页面的查询字符串中的某些值.例如:从category=Old Value到category=New Value. 编写代码如下:

I am trying to replace some value in the query string of the current page using JS. Eg: from category=Old Value to category=New Value. To code looks like this:

var sNewValue = 'New Value';
sQueryString = sQueryString.replace(/category=[^&]+&?/, 'category=' + sNewValue);

除了带有&"号的值外，它都可以正常工作.幸运的是，所有&"号都是URL编码的，因此我知道应该在& 之前丢弃& .我想我应该先行使用，但我不知道该怎么做.我尝试了此正则表达式，但没有运气:/category=[^&(?!amp;)]+&?/

It works fine except for values that have ampersands. Luckily all the ampersands are URL encoded, so I know I should discard the amp; before the &. I think I should use lookaheads, but I don't know how. I tried this regular expression, but with no luck: /category=[^&(?!amp;)]+&?/

谢谢

推荐答案

为什么将&符号编码为& amp;而不是％26?还是我读错了您的问题?

Why are ampersands being encoded as & instead of %26? Or am I reading your question wrong?

如果这是需要的方式，那么如果首先将其分成名称/值对，则处理该查询字符串可能会更容易.

If that's the way it needs to be, it might be easier for you to deal with this query string if you break it into name/value pairs first.

var pairStrings = sQueryString.split(/&(?!amp;)/gi);

然后，您可以使用每个值，而不必担心它是否包含已编码的&是否.

Then you can work with each value without worrying if it contains an encoded & or not.

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