regrtest: simplify the regex used to match test names for the --fromfile
command line option.

Patch by Jim Fasarakis-Hilliard.

Patch by Sam Breese.

Dates and version information from the changelog:

* 2006-08-12 (3.3.7) added SQLITE_CREATE_VTABLE, SQLITE_DROP_VTABLE
* 2006-10-09 (3.3.8) added SQLITE_FUNCTION
* 2009-01-12 (3.6.8) added SQLITE_SAVEPOINT
* 2014-02-03 (3.8.3) added SQLITE_RECURSIVE

Patch by Dingyuan Wang.

Zip files can be larger than 4 GiB if allowZip64
is true (default since Python 3.4)

Patch by Jim Fasarakis-Hilliard.