Hello all!
Ok, it's regex time!
Further than just ipv4 check, it uses common regex knowledge and tips.
I will present you in a coming article tools to help creating, testing and coding in regex world.
For now, here are 4 javascript regexes to check ipv4 user input:
ip without mask:
example: 10.0.0.1
^(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])$
list of ips without mask:
example: 254.0.0.1,10.0.0.24
^(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])+(?:\,(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9]))*$
with cidr suffix:
example: 10.0.0.1/24
^(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\/(?:[1-9][0-9]|[1-9])$
cidr suffixed ip list:
example: 254.0.0.1/32,10.0.3.2/23
^(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\/(?:[1-9][0-9]|[1-9])+(?:\,(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.(?:25[0-4]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[1-9])\/(?:[1-9][0-9]|[1-9]))*$
Ok, that's done! Enjoy!
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