Regex required: It should match for following patterns

Question

Valid:

1. ((int)10)
2. (int)10
3. ((char)((x+y)&1))
4. ((int *)1)

Invalid:

Answer 1

Adding to aioobe's answer:

Looks like you're trying to write an expression parser. As already said in the other answer it is not possible using a regex. You should consider using an expression parser such as JEP or write one yourself using javacc.