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Regular Expression Details

Title Test Find CIDR notation (subnet)
Expression
/^(([01]?\d?\d|2[0-4]\d|25[0-5])\.){3}([01]?\d?\d|2[0-4]\d|25[0-5])\/(\d{1}|[0-2]{1}\d{1}|3[0-2])$/
Description
Validates subnet specified by CIDR notation. A valid CIDR notation begins with the IP address followed by a '/' character and a decimal number specifying the length, in bits, of the subnet mask or routing prefix (number from 0 to 32).
Matches
192.168.100.1/24 | 0.0.0.0/0
Non-Matches
192.168.100.1/33 | 0.0.0.0/90
Author Rating: The rating for this expression. Eugene Kardash
Source
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