Simplest way to create a simple parse in Java

Question

I know about CUP or javaCC or some other parser generators,

but I want to add the ability to understand a simple language to my project, without the need to configure a complex tool as CUP.

The language is something a little too complicated to be parsed with regular expressions, since I want to use operators:

|| && ( ) [ ]

Answer 1

The functionality is provided for Python by a library called PyParse. Probably the library can be integrated using Jython.

Answer 2

The JRE comes with a javascript engine embedded. See http://docs.oracle.com/javase/7/docs/api/javax/script/ScriptEngine.html

Also there is tutorial here -> http://docs.oracle.com/javase/7/docs/technotes/guides/scripting/programmer_guide/