Scanning Grep through Huge Files

Hello,

It has been 3 years since I asked for advise on how to build byte-indexes in 
huge files from pattern matching ( http://tinyurl.com/bnyts52 ) I have been 
operating with a "system" call to grep ever since, but that is obviously not 
portable (first and foremost to standard Windows systems).

I have been searching around, but can't find any newer solutions (as 
bindings to tre or RE2). Did I overlook anything? Are there newish tools on 
streaming file usage?

Thankful for any hint,Joh