Not
v::not(v $negatedValidator)
Negates any rule.
v::not(v::ip())->validate('foo'); // true
In the sample above, validator returns true because 'foo' isn't an IP Address.
You can negate complex, grouped or chained validators as well:
v::not(v::intVal()->positive())->validate(-1.5); // true
Each other validation has custom messages for negated rules.
See also: