[fpc-pascal] StrUtils unit needs Widestring funcs

[Michael Van Canneyt]

I intend to copy it to ustrutils, which will be compiled with widestrings.
Copying all routines to handle ansi/wide string is no solution.

Michael.

On Fri, 15 Feb 2019, AlexeyT wrote:

> According to one of new issues, StrUtils misses many funcs for 
> UnicodeString: RPos, RPosEx.... Maybe someone here can help to write. 
> (In CudaText project I had a bug, when i used RPos on Russian text and 
> got too big result).
>
> -- 
> Regards,
> Alexey
>
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