updated for version 7.3.1028
Problem:    New regexp performance: Copying a lot of position state.
Solution:   Only copy the sub-expressions that are being used.
Added tag v7-3-1028 for changeset 4d81fdda8f35
updated for version 7.3.1029
Problem:    New regexp performance: Unused position state being copied.
Solution:   Keep track of which positions are actually valid.
Added tag v7-3-1029 for changeset e7016af0cbf9
updated for version 7.3.1030
Problem:    Can't build for debugging.
Solution:   Fix struct member names.
Added tag v7-3-1030 for changeset d1f3c77159f9