Valid IPv4/v6 regular expression

valid_ipv4_v6_regular_expression

To get the real regular expression, remove indentation and carriage returns, then replace:
- hexablock with [a-fA-F0-9]{1,4}
- ipv4 with (?:(?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])\.){3}(?:[1-9]?\d|1\d{2}|2[0-4]\d|25[0-5])

(?:
	ipv4
|
	(?:
		(?:hexablock:){7}
		(?:
			hexablock
		|
			:
		)
	|
		(?:hexablock:){6}
		(?:
			:hexablock
		|
			ipv4
		|
			:
		)
	|
		(?:hexablock:){5}
		(?:
			(?::hexablock){1,2}
		|
			:
			ipv4
		|
			:
		)
	|
		(?:hexablock:){4}
		(?:
			(?::hexablock){1,3}
		|
			(?::hexablock)?:
			ipv4
		|
			:
		)
	|
		(?:hexablock:){3}
		(?:
			(?::hexablock){1,4}
		|
			(?::hexablock){0,2}:
			ipv4
		|
			:
		)
	|
		(?:hexablock:){2}
		(?:
			(?::hexablock){1,5}
		|
			(?::hexablock){0,3}:
			ipv4
		|
			:
		)
	|
		(?:hexablock:){1}
		(?:
			(?::hexablock){1,6}
		|
			(?::hexablock){0,4}:
			ipv4
		|
			:
		)
	|
		:
		(?:
			(?::hexablock){1,7}
		|
			(?::hexablock){0,5}:
			ipv4
		|
			:
		)
	)
)