正則表達式爲String.replaceAll

Question

我需要能夠與String類的replaceAll方法中使用的正則表達式與除了一個.*取代的*所有實例已尾隨\

即轉換將是

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

有人能幫我嗎？

Answer 1

使用回顧後。

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

說明：

"(?<!" +  // 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

有可能沒有捕捉組做的，但這應該工作：

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