public void MatchTest()
        {
            var constraint = new RegexConstraint("^[A-Z]+$");

            Assert.IsTrue(constraint.IsValid(null, "HELLO", null));
            Assert.IsFalse(constraint.IsValid(null, "99", null));
        }
        public void CaseInsensitiveByDefault()
        {
            var constraint = new RegexConstraint("^[A-Z]+$");

            Assert.IsTrue(constraint.IsValid(null, "HelLo", null));
        }