feat(trait): Validate for TrimmedNonEmptyString on regex argument (#60)

Author: KristianH

src/Util/ValueObjectTrait.php

@@ -378,7 +378,7 @@ final protected static function nullOrString(array $values, string $key, ?int $m
         }
 
         if (null !== $regex) {
-            Assert::stringNotEmpty($regex);
+            TrimmedNonEmptyString::fromString($regex);
             Assert::regex($values[$key], $regex);
         }
 
@@ -405,7 +405,7 @@ final protected static function string(array $values, string $key, ?int $maxLeng
         }
 
         if (null !== $regex) {
-            Assert::stringNotEmpty($regex);
+            TrimmedNonEmptyString::fromString($regex);
             Assert::regex($values[$key], $regex);
         }