Regular Expressions 101

POSIX ERE compatible, suitable for usage in Bash [ testing Attributions Derived from [regex101: RFC1918 - Private IPv4 addresses by 0100101101001.

Validate a given IP v4 address against all three defined Private IPv4 Subnets as statet in RFC1918 10.0.0.0/8 172.16.0.0/20 192.168.0.0/16 ...

IP address with Subnet

Comma separated CIDR network addresses

dailynewstalk.org

Helps to search a line over a text file with ignoring (excluding from searching) the lines started with a # (hash) symbol ^(.)?^\sdev1 #| Environment | Port-prefix | Subnet | Target-host | #dev1 300 8 ibdock2...

Validates that you provide a CIDR in one of the following valid ranges. 0.0.0 – 127.255.255.255 127.0.0.0/8 0.0.0 – 10.255.255.255 10.0.0.0/8 16.0.0 – 172. 31.255.255 172.16.0.0/12 192.168.0.0 – 192.168.255.255 192.168.0.0/16...

Cisco config find each DHCP Pool Either full subnet pool or a static device entry pool

Match any IP adress or Subnet masks and split all bytes in capture groups

Intended to verify a valid IPv4 subnet mask against every valid IPv4 subnet mask possible using octet format. Does not check against a string that is using CIDR notation.

Validates the subnet. Not the subnet mask. It is only for 2 or 3 octets

This regexp is able to find ipv6 subnets in the compressed form (e.g: 2001:db8::/32). It doesn't perform any validation to the ipv6 addresses itself though.

subnet cidr check example 192.168.1.0/30