Translations:ExpressionScript How-tos/22/en
From LimeSurvey Manual
Here is some of the unsupported syntax
No support for '++', '--', '%',';': min( ++ age, -- age,age % 2) ;
Nor '|', '&', '^': (sum(2 | 3,3 & 4,5 ^ 6)}
Nor arrays: name [ 2 ] ,name [ 'mine' ]