or() with capture()

[Tavio]

It seems to me that the following expression:

VerbalExpression testRegex = regex()
                .capture()
                .find("abc")
                .or("def")
                .build();

should evaluate to the regex: /(?:((?:abc)|(?:(?:def))))/, but instead it evaluates to: /(?:((?:abc))|(?:(?:def)))/. As a result, if we test this expression against the string "def" it produces a match but no group is captured. This happens because the implementation of or() closes any opening parenthesis it finds in the string that precedes it.

I don't know why or() was implemented this way, but I believe the implementation of oneOf() I propose in #31 may fix this problem.