Regular Expressions 101

Found in here, stackoverflow url.

When validating an IPv4 address I often have to reject devices that the first and last octet are 0.

Accepts: Valid IPv4: 127.0.0.1 192.168.1.1 192.168.1.255 192.168.255.255...

regex to capture ip4/ip6 addresses with named capture groups. The Following features are included: PHP and python support ip4 byte size check (ensures byte can't exceed 255) ip6 checks if hex characters are valid uses a negative lookbehind to check if the ip is a word on its own...

Find ipv4 addresses

This expression grabs any IPV4 address from any text, any time, anywhere. Hopefully.

Validates IPv4 Address for Java

Use It for partial/complete IPv4 address input text checking. OK examples: 19 / 192. / 192.168.1 / 192.168.1.1 / 0.0.0.0 KO examples: 1A / 01 / 192.168..1

This Regex finds IPv4 addresses

Short form validation of an IP6 address Less complex than other examples I have seen around

Valid ip addreses

IPv4 Address Validation Regex