Regex should also cover SST-Field

[jsubhi]

There should be an option to apply a regex-based filter also to the "Sonderstandort" Field (7100 $f / 209A $f).
Preferably this would be a separte regex that is tested first, before the main regex is tested. If this field is left empty it should match any signature.

Probably there is no nee to support capture groups ($1, $2 etc) for this field - it would be used just as a filter.

[jsubhi]

Works as expected so far. Makes creating some signature regexes much easier!