The Internet Protocol version 4 (IPv4) is the dominant protocol for routing devices over the internet. IPv4 addresses are usually represented by four 1-byte decimal numbers (0 to 255) separated by three dots.
In this exercise, we are asked to check whether a given string of characters is a valid IPv4 address or not. Leading zeros are allowed, however each byte should only contain at most 3 characters, with no spaces.
For example, the following are valid IPv4 address:
'123.123.123.123'
'0.255.001.010'
But the following are invalid addresses:
'0123.123.123.123'
'123. 23.123.123'
'123.123'
'123,123.123.123'
'abc.123.123.123'
'123.456.789.111'
'i like matlab'
The following restrictions apply:
- The function should only have one (1) line of code, excluding the function start line.
- Semicolons (;) are considered end-of-line characters.
- Please suppress the function end line. Keyword 'end' is not allowed.
- Regular expressions are allowed.
- Only 'pure' matlab functions/commands are allowed (no java, no python).
---------------
NOTE:
This would be the last of my one-line challenges.
Solution Stats
Problem Comments
4 Comments
Solution Comments
Show comments
Loading...
Problem Recent Solvers5
Suggested Problems
-
First non-zero element in each column
942 Solvers
-
1181 Solvers
-
Given a matrix, swap the 2nd & 3rd columns
1256 Solvers
-
17570 Solvers
-
What is Sum Of all elements of Matrix
444 Solvers
More from this Author116
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
> Regular expressions are not allowed.
I don't understand this restriction. This kind of task is exactly what regular expressions are for.
HI Christian,
Regex is now allowed. Thanks.
Ramon, were string operations banned as well (with regexp) initially?
String functions are NOT banned.