String.replaceAll的正则表达式

Question

我需要一个可以与String类的replaceAll方法一起使用的正则表达式，将*的所有实例替换为.*，除了尾随\ < / p>

即。转换将是

[any character]*[any character] => [any character].*[any character]
* => .*
\* => \* (i.e. no conversion.)

有人可以帮帮我吗？

Answer 1

使用lookbehind。

String resultString = subjectString.replaceAll("(?<!\\\\)\\*", ".*");

说明：

"(?<!" +     // Assert that it is impossible to match the regex below with the match ending at this position (negative lookbehind)
   "\\\\" +       // Match the character “\” literally
")" +
"\\*"         // Match the character “*” literally

Answer 2

可能没有捕获组，但这应该有效：

myString.replaceAll("\\*([^\\\\]|$)", "*.$1");