我正在寻找一个与ä字符匹配的正则表达式，但仅当它不在双引号内时。
我试图用负面看法来解决这个问题，不应该有双引号，后跟任何不是双引号的字符，但实际上只有偶数时间，这意味着1,3,5，等
尝试就像这样：(?<!("[^"]*(?:(?:"[^"]*){2})*?)?)ä
但它不起作用。
或者对于双引号后面的正面观察，然后是任何不是双引号但只有奇数次数的字符，这意味着0,2,4等
尝试就像这样：(?<=(?:(?:"[^"]*){2})*)ä
但它也不起作用。
所以我的所有尝试都失败了！这是我的测试字符串：
This ä is to replace
"This ä is not to replace"
"This ä is not to replace" but this ä is to replace
This ä is to replace but "this ä is not to replace"
This ä is to replace, "this ä is not to replace", this ä is again to replace
"This ä is not to replace", "this ä neither", but this ä is to replace
"This ä and this ä aren't to replace", but this ä and this ä are to replace
This is the ultimate mix: ä ä "ä ä ä" ä ä ä "ä ä" "ä" "ä ä" ä ä ä