如何为 X.0.4472.114 之类的东西创建正则表达式，其中 X 是一个数字？

Question

I want to create a regex for something from the template:

X . number . number number number number . number number

or :

X . number . number number number number . number number number

Where X is a variable that contains a number.

eg:

X = 102

then:

102.3.2345.234 is a valid 102.3.2345.23 is valid too.

I have tried to use "[" + X + "]" + "[.]0[.][\\\\d][\\\\d][\\\\d][\\\\d][.][\\\\d][\\\\d]" , but it's not working

Answer 1

如果您在变量x有数字开头，那么您的正则表达式模式可以构造为

 String pattern = x + "\\.\\d\\.\\d{4}.\\d{2,3}";

Answer 2

You can use x + "\\\\.\\\\d\\\\.\\\\d{4}\\\\.\\\\d{2,3}" as the pattern.

Details of the regex:

• \\. : A dot
• \\d : A single digit
• \\d{4} : 4 digits
• \\d{2,3} : 2 or 3 digits