in ,

^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$

^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$ | code-memes, express-memes, comment-memes, regular expression-memes | ProgrammerHumor.io
code-memes, express-memes, comment-memes, regular expression-memes | ProgrammerHumor.io

Content

"Good code should be self explanatory and obvious without comments." Regular expressions: