正则表达式匹配相同字符串中的非唯一字符(Regex match a non

正则表达式匹配相同字符串中的非唯一字符(Regex match a non-unique character in same string)

这是一个示例字符串。 我需要修复其中的更多内容：

"måde", "answer" => "råd");

在此字符串中有2个字符实例å。 我想找到一个匹配使用正则表达式的å在råd ，而忽略了å在måde 。

所以基本上我需要在answer之后找到一个匹配的匹配。

我认为(?<=answer)å(?=\;)会起作用，但我对此非常陌生，如果有人能指出我正确的方向，我会非常感激。

我之前尝试过问这个问题，但由于某种原因而被投票，所以我试着在这里重新制定它。 我希望它足够清楚。

Here is an example string. I have many more of these that I need to fix:

"måde", "answer" => "råd");

In this string there are 2 instances of the character å. I want find a match for the å in råd using regex, while ignoring the the å in måde.

So basically I need to find a match of an occurrence of å after answer.

I thought that (?<=answer)å(?=\;) would work, but I'm really new to this and would very much appreciate it if someone could point me in the right direction.

I tried asking this question before but got downvoted for some reason, so I tried to reformulate it here. I hope it is clear enough.

最满意答案

看后面（通常）不能是可变长度，但通过使用负向前看，你告诉它不匹配：

å(?!.*answer)

这匹配“å”，但仅在“回答”未出现在其后的某处。

Look behinds (typically) can't be of variable length, but by using a negative look ahead, you tell it what not to match:

å(?!.*answer)

This matches "å", but only if "answer" doesn't appear somewhere after it.