正则表达式替换 java 中 csv 字符串中的空值

Question

我有一个带值的字符串

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

我想用*替换 CSV 文件中的两个连续空值。

预期 output：

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

这是我试过的，

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

但这给了我低于 output，第一次出现替换

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

Answer 1

您可以使用带有前瞻和后视的正则表达式：

(?<=,)(?=,)

并将其替换为"*"

正则表达式演示

Java 代码：

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