Amend(2) 8c67cb8c: (FindAdv: Try to make regex search with format enabled somehow...

Amend(2) 8c67cb8c: (FindAdv: Try to make regex search with format enabled somehow faster)

Use innermost nesting to start searches.
Some fine tuning to determine correct match.
(If the regex contains '(\S)\1' at the end, then this regex would match '}}',
but this is often the case at and of examined string. We have to disable this invalid match.
)