Regex Tester & Validator
Test, validate and match regular expressions
Test, validate and match regular expressions
This regex matches strings formatted as IPv4 addresses while excluding common private and loopback IP ranges (10.x.x.x, 127.x.x.x, 192.168.x.x, and 172.16-31.x.x). It uses negative lookbehind assertions to fail the match if it starts with these specific prefixes. It is commonly used in log parsing or security analysis to identify public IP addresses.