java - 正则表达式替换java中csv字符串中的空值

Question

我有一个具有值的字符串

 "ABC","ONE", "Hello",,,"2019"

我想用 * 替换 CSV 文件中两个连续的空值。

预期输出:

 "ABC","ONE", "Hello","*","*","2019"

这是我尝试过的

line.replaceAll(",,","\"*\"");

但这给了我以下输出，在第一次出现时替换

"ABC","ONE", "Hello","*","2019"

Answer 1

您可以使用具有前向和后向的正则表达式:

(?<=,)(?=,)

并将其替换为“*”

RegEx Demo

Java 代码:

repl = str.replaceAll("(?<=,)(?=,)", "\"*\"");