Forums Scripts & Popups Regex ignore trailing space

Testing some regex out, and can't seem to get my pattern match to ignore the space between capture groups.

Pattern i am using: ((.{2,}?)\2{4,})

if i enter: "the quick brown fox jumps over? " and put it in 5 times, and the 6th message does not contain a trailing space, it seems to not match the pattern.

Thanks!