IPv4 Validation

Create a function that takes a string (IPv4 address in standard dot-decimal format) and returns True if the IP is valid or False if it's not.

Examples

is_valid("1.2.3.4") ➞ True

is_valid("1.2.3") ➞ False

is_valid("1.2.3.4.5") ➞ False

is_valid("123.45.67.89") ➞ True

is_valid("123.456.78.90") ➞ False

is_valid("123.045.067.089") ➞ False

Notes

• IPv6 addresses are not valid.
• Leading zeros are not valid ("123.045.067.089" should return False).
• You can expect a single string for every test case.
• Numbers may only be between 1 and 255.
• The last digit may not be zero, but any other might.