We need to add support for unicode.

At the moment pcre is compiled with:
8-bit support
No UTF-8 support
32-bit support
No UTF-32 support
No Unicode properties support
No just-in-time compiler support
Newline sequence is LF
\R matches all Unicode newlines
Internal link size = 2
POSIX malloc threshold = 10
Parentheses nest limit = 250
Default match limit = 10000000
Default recursion depth limit = 10000000
Match recursion uses stack