IP address is a string in the form "A.B.C.D", where the value of A, B, C, and D may range from 0 to 255. Leading zeros are allowed. The length of A, B, C, or D can't be greater than 3.
https://www.youtube.com/watch?v=e8LvIbWOdRM&t=3s
Regex Introduction:
https://www.youtube.com/watch?v=jxWun1YwwnE&t=6s
Tool used:
https://regexr.com/
