How to verify the correctness of IP and port format through regular expressions

This article will explain in detail how to verify the correctness of IP and port format through regular expressions. Xiaobian thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Regular expression for 1:ip:

The format is made up of "." Four segmented parts, each with a range of 0-255

The regularity of each paragraph can be divided into several parts: 200-255, 100-1999, 10-99, 0-9.

Regular expression for each part: 2 [0-4]\ d | 25 [0-5]; 1\ d {2}; [1-9]\ d;\ d

So it is connected to\ d | [1-9]\ d | 1\ d {2} | 2 [0-4]\ d | 25 [0-5]

Then the rule of IP is (\ d | [1-9]\ d | 1\ d {2} | 2 [0-4]\ d | 25 [0-5]). (\ d | [1-9]\ d | 1\ d {2} | 2 [0-4]\ d | 25 [0-5])\. (\ d | [1-9]\ d | 1 [0-4] 2} | 25 [0-5])\. (\ d | [1-9]\ d | 1\ d {2} | 2 [0-4]\ d | 25 [0-5])

Expressed in JS as / ^ (\ d | [1-9]\ d | 1\ d {2} | 2 [0-4]\ d | 25 [0-5])\. (\ d | [1-9]\ d | 1\ d {2} | 2 [0-4])\ d | 25 [0-5])\. (\ d | [1-9]\ d | 1\ d {2} | 25 [0-5])\. (\ d | [1-9]\ d | 1\ d {2} | 2 [0-5]). -4]\ d | 25 [0-5]) $/

2: regular expression of the port:

The format is 0-65535.

The same principle can be divided into several parts: 60000-65535 10 000-59999 10-9999 10-99 10-99 10-9

The regularity of each part is: 6 [0-4]\ d {4} | 65 [0-4]\ d {2} | 655 [0-2]\ d | 6553 [0-5]; [1-5]\ d {4}; [1-9]\ d {3}; [1-9]\ d {2}; [1-9]\ d; [0-9]

The results are as follows: ([0-9] | [1-9]\ d {1Magne3} | [1-5]\ d {4} | 6 [0-4]\ d {4} | 65 [0-4]\ d {2} | 6553 [0-5])

Expressed in JS as: / ^ ([0-9] | [1-9]\ d {1pr 3} | [1-5]\ d {4} | 6 [0-4]\ d {4} | 65 [0-4]\ d {2} | 6553 [0-5]) $/

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