ipv4#

Built-in regex plugin for validating IPv4 addresses.

Usage Scenarios#

• Network Configuration: Validate IP address input
• Security: Verify IP addresses in firewall rules
• System Administration: Check server IP configurations

Examples#

import { regex } from 'funtool';

// Basic validation
const isValid = regex.checker('192.168.1.1').use('ipv4').isValid();

// With error handling
const result = regex.checker('invalid').use('ipv4');
if (!result.isValid()) {
  console.log('Invalid IPv4 address');
}

Pattern#

/^(25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)){3}$/

Validation Rules#

• Validates standard IPv4 format (0.0.0.0 to 255.255.255.255)
• Each octet must be between 0-255
• No leading zeros allowed (except for 0 itself)

Error Message#

Returns false for invalid IPv4 addresses without a specific message.