Spring Expression - Methods

Methods 

Methods are invoked using typical Java programming syntax. You may also invoke methods on literals. Varargs are also supported.
// string literal, evaluates to "bc"

String c = parser.parseExpression("'abc'.substring(2, 3)").getValue(String.class); 
// evaluates to true 

boolean isMember = parser.parseExpression("isMember('Mihajlo Pupin')").getValue( societyContext, Boolean.class);