Ah. The infix type got me. Keep on thinking it's an infinate language, which doesn't make sence.
Thank JosAH
Both regular languages as well as context free languages can be infinite languages
but, as the pumping lemma clearly shows and as the saying goes: regular languages
can't count. You need to be able to count because of those parentheses that
make up nested expressions. In normal words: you can't come up with a
regular expression that matches a string of well balanced parentheses.
kind regards,
Jos