Nullable structure in a repetition or option

Messages > Nullable structure in a repetition or option

The meaning of a "(...)+" repeat or a "(...)*" repeat or an "(...)?" onption isn't clear if it contains a nullable structure.

Examplee:

( "a"? )+ "b"

The structure "( "a"? )+" could be as interpreted as nullable. An occurrence of b without previous "a" would be accepted. But you could argue too that the loop has  to be passed once at least.

( "a"* {{iCount++;}} )* "b"

How often should iCount be incremented for several "a"  in the input? Thar's not clear!

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