Java Regular expression: IPV4 IP Address

The IP address of the IPV4 is (1~255). (0~255). (0~255). (0~255) format

The corresponding regular expression is given below:

"^ (1\\d{2}|2[0-4]\\d|25[0-5]| [1-9]\\d| [1-9]) \\."

+ "(1\\d{2}|2[0-4]\\d|25[0-5]| [1-9]\\d|\\d] \ \. "

+ "(1\\d{2}|2[0-4]\\d|25[0-5]| [1-9]\\d|\\d] \ \. "

+ "(1\\d{2}|2[0-4]\\d|25[0-5]| [1-9]\\d|\\d) $ "

The above one does not leak is the correct authentication IP regular expression, simple explanation

\\d represents any number of 0~9

{2} indicates exactly two occurrences

[0-4] represents any number of 0~4

| That means, or

() The parentheses above are not small enough to fetch a matching string, and several () in the expression represent several corresponding matching strings

1\\D{2} means any number between 100~199.

2[0-4]\\d means any number between 200~249.

25[0-5] means any number between 250~255.

[1-9]\\d means any number between 10~99.

[1-9]) It means any number between 1~9.

The point is to be escaped (special characters are similar, @ is added \ Escaped)

Speaking of which, it should be clear that the meaning of the above regular expression.

Reprint: http://blog.csdn.net/u012806692/article/details/50635590

Java Regular expression: IPV4 IP Address