Problem with standard regex

[Yuriy Skalko]

> Thanks. I am not so sure that 'from_ascii()' is the better choice comparing to
> 'from_utf8()' though.

Maybe it will be better, but I cannot remember seeing exceptions with 
`what`-messages not in plain English. Feel free to update.


> BTW, I tested the regexes with Russian documents, and found an error in 
> Additional.lyx
> Correction attached.

Really, that was missed out. Please commit it.


> Is the regex handling (with enabled format) now to your liking?
> 
>         Kornel

I've tested the regexes (with and without format). Now there are no 
problems with Cyrillic in any practical regexes I can think of. Thanks 
for advsearch that is really usable now, Kornel!


Yuriy