Java中uuid在替换中划线的时候为什么要用两个反斜线？

Answer 1

The replacement here is to use Java’s regular expression, and Java’s regular expression is very messed up. The underscore in the regular expression must be escaped with a backslash. In Java, the backslash is a special character and must also be escaped. That’s why there are two backslashes

Answer 2

Java replaceAll split and the like use regular expressions by default

For solutions without escaping, please refer to my previous answer:

https://segmentfault.com/q/10...

Answer 3

You can do it directly, I just replaced it directly